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Finding the Fourth Proportional to 71,688.86, 98,932.24 and 39,421.44

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Solution

The fourth proportional to 71,688.86, 98,932.24 and 39,421.44 is: 54,402.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,688.86 : 98,932.24 = 39,421.44 : x
  2. Step 2: Convert to fraction form
    71,688.86/98,932.24 = 39,421.44/x
  3. Step 3: Cross multiply
    71,688.86x = 98,932.24 × 39,421.44
  4. Step 4: Simplify right side
    71,688.86x = 3,900,051,783.50
  5. Step 5: Solve for x
    x = 3,900,051,783.50/71,688.86
  6. Step 6: Final answer
    x = 54,402.48

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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.