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Finding the Fourth Proportional to 138,689.97, 208,036.33 and 43,918.38

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Solution

The fourth proportional to 138,689.97, 208,036.33 and 43,918.38 is: 65,878.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,689.97 : 208,036.33 = 43,918.38 : x
  2. Step 2: Convert to fraction form
    138,689.97/208,036.33 = 43,918.38/x
  3. Step 3: Cross multiply
    138,689.97x = 208,036.33 × 43,918.38
  4. Step 4: Simplify right side
    138,689.97x = 9,136,618,594.75
  5. Step 5: Solve for x
    x = 9,136,618,594.75/138,689.97
  6. Step 6: Final answer
    x = 65,878.01

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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.