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Finding the Fourth Proportional to 103,908.69, 155,607.89 and 66,357.90

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Solution

The fourth proportional to 103,908.69, 155,607.89 and 66,357.90 is: 99,373.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,908.69 : 155,607.89 = 66,357.90 : x
  2. Step 2: Convert to fraction form
    103,908.69/155,607.89 = 66,357.90/x
  3. Step 3: Cross multiply
    103,908.69x = 155,607.89 × 66,357.90
  4. Step 4: Simplify right side
    103,908.69x = 10,325,812,472.04
  5. Step 5: Solve for x
    x = 10,325,812,472.04/103,908.69
  6. Step 6: Final answer
    x = 99,373.91

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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.