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Finding the Fourth Proportional to 71,320.40, 98,421 and 39,489.20

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Solution

The fourth proportional to 71,320.40, 98,421 and 39,489.20 is: 54,494.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,320.40 : 98,421 = 39,489.20 : x
  2. Step 2: Convert to fraction form
    71,320.40/98,421 = 39,489.20/x
  3. Step 3: Cross multiply
    71,320.40x = 98,421 × 39,489.20
  4. Step 4: Simplify right side
    71,320.40x = 3,886,566,553.20
  5. Step 5: Solve for x
    x = 3,886,566,553.20/71,320.40
  6. Step 6: Final answer
    x = 54,494.46

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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.