Home / 103,721.91-155,299.56-78,347.04

Finding the Fourth Proportional to 103,721.91, 155,299.56 and 78,347.04

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Solution

The fourth proportional to 103,721.91, 155,299.56 and 78,347.04 is: 117,306.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,721.91 : 155,299.56 = 78,347.04 : x
  2. Step 2: Convert to fraction form
    103,721.91/155,299.56 = 78,347.04/x
  3. Step 3: Cross multiply
    103,721.91x = 155,299.56 × 78,347.04
  4. Step 4: Simplify right side
    103,721.91x = 12,167,260,839.30
  5. Step 5: Solve for x
    x = 12,167,260,839.30/103,721.91
  6. Step 6: Final answer
    x = 117,306.56

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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.