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Finding the Fourth Proportional to 138,749.20, 208,123.80 and 138,749.20

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Solution

The fourth proportional to 138,749.20, 208,123.80 and 138,749.20 is: 208,123.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,749.20 : 208,123.80 = 138,749.20 : x
  2. Step 2: Convert to fraction form
    138,749.20/208,123.80 = 138,749.20/x
  3. Step 3: Cross multiply
    138,749.20x = 208,123.80 × 138,749.20
  4. Step 4: Simplify right side
    138,749.20x = 28,877,010,750.96
  5. Step 5: Solve for x
    x = 28,877,010,750.96/138,749.20
  6. Step 6: Final answer
    x = 208,123.80

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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.