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Finding the Fourth Proportional to 138,747.60, 208,070.20 and 45,256.40

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Solution

The fourth proportional to 138,747.60, 208,070.20 and 45,256.40 is: 67,867.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,747.60 : 208,070.20 = 45,256.40 : x
  2. Step 2: Convert to fraction form
    138,747.60/208,070.20 = 45,256.40/x
  3. Step 3: Cross multiply
    138,747.60x = 208,070.20 × 45,256.40
  4. Step 4: Simplify right side
    138,747.60x = 9,416,508,199.28
  5. Step 5: Solve for x
    x = 9,416,508,199.28/138,747.60
  6. Step 6: Final answer
    x = 67,867.90

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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.