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Finding the Fourth Proportional to 128,498, 177,363.12 and 74,793.36

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Solution

The fourth proportional to 128,498, 177,363.12 and 74,793.36 is: 103,235.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,498 : 177,363.12 = 74,793.36 : x
  2. Step 2: Convert to fraction form
    128,498/177,363.12 = 74,793.36/x
  3. Step 3: Cross multiply
    128,498x = 177,363.12 × 74,793.36
  4. Step 4: Simplify right side
    128,498x = 13,265,583,684.88
  5. Step 5: Solve for x
    x = 13,265,583,684.88/128,498
  6. Step 6: Final answer
    x = 103,235.72

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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.