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Finding the Fourth Proportional to 71,685.36, 98,928.28 and 39,421.30

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Solution

The fourth proportional to 71,685.36, 98,928.28 and 39,421.30 is: 54,402.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,685.36 : 98,928.28 = 39,421.30 : x
  2. Step 2: Convert to fraction form
    71,685.36/98,928.28 = 39,421.30/x
  3. Step 3: Cross multiply
    71,685.36x = 98,928.28 × 39,421.30
  4. Step 4: Simplify right side
    71,685.36x = 3,899,881,391.81
  5. Step 5: Solve for x
    x = 3,899,881,391.81/71,685.36
  6. Step 6: Final answer
    x = 54,402.76

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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.