Home / 138,860.91-208,301.07-68,721.39

Finding the Fourth Proportional to 138,860.91, 208,301.07 and 68,721.39

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Solution

The fourth proportional to 138,860.91, 208,301.07 and 68,721.39 is: 103,086.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,860.91 : 208,301.07 = 68,721.39 : x
  2. Step 2: Convert to fraction form
    138,860.91/208,301.07 = 68,721.39/x
  3. Step 3: Cross multiply
    138,860.91x = 208,301.07 × 68,721.39
  4. Step 4: Simplify right side
    138,860.91x = 14,314,739,068.89
  5. Step 5: Solve for x
    x = 14,314,739,068.89/138,860.91
  6. Step 6: Final answer
    x = 103,086.89

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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.