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Finding the Fourth Proportional to 128,686.73, 193,032.90 and 90,580.28

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Solution

The fourth proportional to 128,686.73, 193,032.90 and 90,580.28 is: 135,872.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,686.73 : 193,032.90 = 90,580.28 : x
  2. Step 2: Convert to fraction form
    128,686.73/193,032.90 = 90,580.28/x
  3. Step 3: Cross multiply
    128,686.73x = 193,032.90 × 90,580.28
  4. Step 4: Simplify right side
    128,686.73x = 17,484,974,613.79
  5. Step 5: Solve for x
    x = 17,484,974,613.79/128,686.73
  6. Step 6: Final answer
    x = 135,872.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.