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Finding the Fourth Proportional to 123,702.81, 170,604.59 and 86,066.97

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Solution

The fourth proportional to 123,702.81, 170,604.59 and 86,066.97 is: 118,699.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,702.81 : 170,604.59 = 86,066.97 : x
  2. Step 2: Convert to fraction form
    123,702.81/170,604.59 = 86,066.97/x
  3. Step 3: Cross multiply
    123,702.81x = 170,604.59 × 86,066.97
  4. Step 4: Simplify right side
    123,702.81x = 14,683,419,699.06
  5. Step 5: Solve for x
    x = 14,683,419,699.06/123,702.81
  6. Step 6: Final answer
    x = 118,699.16

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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.