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Finding the Fourth Proportional to 71,308.88, 98,406.80 and 39,478.28

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Solution

The fourth proportional to 71,308.88, 98,406.80 and 39,478.28 is: 54,480.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,308.88 : 98,406.80 = 39,478.28 : x
  2. Step 2: Convert to fraction form
    71,308.88/98,406.80 = 39,478.28/x
  3. Step 3: Cross multiply
    71,308.88x = 98,406.80 × 39,478.28
  4. Step 4: Simplify right side
    71,308.88x = 3,884,931,204.30
  5. Step 5: Solve for x
    x = 3,884,931,204.30/71,308.88
  6. Step 6: Final answer
    x = 54,480.33

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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.