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Finding the Fourth Proportional to 138,672.40, 208,008.60 and 68,688.40

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Solution

The fourth proportional to 138,672.40, 208,008.60 and 68,688.40 is: 103,032.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,672.40 : 208,008.60 = 68,688.40 : x
  2. Step 2: Convert to fraction form
    138,672.40/208,008.60 = 68,688.40/x
  3. Step 3: Cross multiply
    138,672.40x = 208,008.60 × 68,688.40
  4. Step 4: Simplify right side
    138,672.40x = 14,287,777,920.24
  5. Step 5: Solve for x
    x = 14,287,777,920.24/138,672.40
  6. Step 6: Final answer
    x = 103,032.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.