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Finding the Fourth Proportional to 128,663.36, 177,545.76 and 72,065.60

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Solution

The fourth proportional to 128,663.36, 177,545.76 and 72,065.60 is: 99,445.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,663.36 : 177,545.76 = 72,065.60 : x
  2. Step 2: Convert to fraction form
    128,663.36/177,545.76 = 72,065.60/x
  3. Step 3: Cross multiply
    128,663.36x = 177,545.76 × 72,065.60
  4. Step 4: Simplify right side
    128,663.36x = 12,794,941,721.86
  5. Step 5: Solve for x
    x = 12,794,941,721.86/128,663.36
  6. Step 6: Final answer
    x = 99,445.11

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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.