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Finding the Fourth Proportional to 128,507.73, 177,341.04 and 71,919.11

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Solution

The fourth proportional to 128,507.73, 177,341.04 and 71,919.11 is: 99,248.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,507.73 : 177,341.04 = 71,919.11 : x
  2. Step 2: Convert to fraction form
    128,507.73/177,341.04 = 71,919.11/x
  3. Step 3: Cross multiply
    128,507.73x = 177,341.04 × 71,919.11
  4. Step 4: Simplify right side
    128,507.73x = 12,754,208,876.57
  5. Step 5: Solve for x
    x = 12,754,208,876.57/128,507.73
  6. Step 6: Final answer
    x = 99,248.57

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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.