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Finding the Fourth Proportional to 310,791.39, 466,140.89 and 86,128.40

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Solution

The fourth proportional to 310,791.39, 466,140.89 and 86,128.40 is: 129,179.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    310,791.39 : 466,140.89 = 86,128.40 : x
  2. Step 2: Convert to fraction form
    310,791.39/466,140.89 = 86,128.40/x
  3. Step 3: Cross multiply
    310,791.39x = 466,140.89 × 86,128.40
  4. Step 4: Simplify right side
    310,791.39x = 40,147,966,914.89
  5. Step 5: Solve for x
    x = 40,147,966,914.89/310,791.39
  6. Step 6: Final answer
    x = 129,179.79

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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.