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Finding the Fourth Proportional to 128,737.98, 177,648.62 and 72,138.42

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Solution

The fourth proportional to 128,737.98, 177,648.62 and 72,138.42 is: 99,545.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,737.98 : 177,648.62 = 72,138.42 : x
  2. Step 2: Convert to fraction form
    128,737.98/177,648.62 = 72,138.42/x
  3. Step 3: Cross multiply
    128,737.98x = 177,648.62 × 72,138.42
  4. Step 4: Simplify right side
    128,737.98x = 12,815,290,401.29
  5. Step 5: Solve for x
    x = 12,815,290,401.29/128,737.98
  6. Step 6: Final answer
    x = 99,545.53

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1.5x scale

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.