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Finding the Fourth Proportional to 128,565.61, 177,255.67 and 99,836.53

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Solution

The fourth proportional to 128,565.61, 177,255.67 and 99,836.53 is: 137,646.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,565.61 : 177,255.67 = 99,836.53 : x
  2. Step 2: Convert to fraction form
    128,565.61/177,255.67 = 99,836.53/x
  3. Step 3: Cross multiply
    128,565.61x = 177,255.67 × 99,836.53
  4. Step 4: Simplify right side
    128,565.61x = 17,696,591,015.63
  5. Step 5: Solve for x
    x = 17,696,591,015.63/128,565.61
  6. Step 6: Final answer
    x = 137,646.38

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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.