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Finding the Fourth Proportional to 71,321.40, 98,422.38 and 39,490.20

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Solution

The fourth proportional to 71,321.40, 98,422.38 and 39,490.20 is: 54,495.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,321.40 : 98,422.38 = 39,490.20 : x
  2. Step 2: Convert to fraction form
    71,321.40/98,422.38 = 39,490.20/x
  3. Step 3: Cross multiply
    71,321.40x = 98,422.38 × 39,490.20
  4. Step 4: Simplify right side
    71,321.40x = 3,886,719,470.68
  5. Step 5: Solve for x
    x = 3,886,719,470.68/71,321.40
  6. Step 6: Final answer
    x = 54,495.84

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.