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Finding the Fourth Proportional to 868,347,643.70, 1,218,911,563.90 and 868,347,643.70

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Solution

The fourth proportional to 868,347,643.70, 1,218,911,563.90 and 868,347,643.70 is: 1,218,911,563.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    868,347,643.70 : 1,218,911,563.90 = 868,347,643.70 : x
  2. Step 2: Convert to fraction form
    868,347,643.70/1,218,911,563.90 = 868,347,643.70/x
  3. Step 3: Cross multiply
    868,347,643.70x = 1,218,911,563.90 × 868,347,643.70
  4. Step 4: Simplify right side
    868,347,643.70x = 1,058,438,984,391,247,104
  5. Step 5: Solve for x
    x = 1,058,438,984,391,247,104/868,347,643.70
  6. Step 6: Final answer
    x = 1,218,911,563.90

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.