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Finding the Fourth Proportional to 8,572.20, 12,858.30 and 7,859.40

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Solution

The fourth proportional to 8,572.20, 12,858.30 and 7,859.40 is: 11,789.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,572.20 : 12,858.30 = 7,859.40 : x
  2. Step 2: Convert to fraction form
    8,572.20/12,858.30 = 7,859.40/x
  3. Step 3: Cross multiply
    8,572.20x = 12,858.30 × 7,859.40
  4. Step 4: Simplify right side
    8,572.20x = 101,058,523.02
  5. Step 5: Solve for x
    x = 101,058,523.02/8,572.20
  6. Step 6: Final answer
    x = 11,789.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.