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Finding the Fourth Proportional to 128,587.31, 177,435.32 and 74,138.87

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Solution

The fourth proportional to 128,587.31, 177,435.32 and 74,138.87 is: 102,302.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,587.31 : 177,435.32 = 74,138.87 : x
  2. Step 2: Convert to fraction form
    128,587.31/177,435.32 = 74,138.87/x
  3. Step 3: Cross multiply
    128,587.31x = 177,435.32 × 74,138.87
  4. Step 4: Simplify right side
    128,587.31x = 13,154,854,195.78
  5. Step 5: Solve for x
    x = 13,154,854,195.78/128,587.31
  6. Step 6: Final answer
    x = 102,302.90

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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.