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Finding the Fourth Proportional to 151,354.70, 208,869.51 and 87,729.40

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Solution

The fourth proportional to 151,354.70, 208,869.51 and 87,729.40 is: 121,066.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    151,354.70 : 208,869.51 = 87,729.40 : x
  2. Step 2: Convert to fraction form
    151,354.70/208,869.51 = 87,729.40/x
  3. Step 3: Cross multiply
    151,354.70x = 208,869.51 × 87,729.40
  4. Step 4: Simplify right side
    151,354.70x = 18,323,996,790.59
  5. Step 5: Solve for x
    x = 18,323,996,790.59/151,354.70
  6. Step 6: Final answer
    x = 121,066.59

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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.