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Finding the Fourth Proportional to 103,616.70, 155,425.05 and 66,291.90

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Solution

The fourth proportional to 103,616.70, 155,425.05 and 66,291.90 is: 99,437.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,616.70 : 155,425.05 = 66,291.90 : x
  2. Step 2: Convert to fraction form
    103,616.70/155,425.05 = 66,291.90/x
  3. Step 3: Cross multiply
    103,616.70x = 155,425.05 × 66,291.90
  4. Step 4: Simplify right side
    103,616.70x = 10,303,421,872.10
  5. Step 5: Solve for x
    x = 10,303,421,872.10/103,616.70
  6. Step 6: Final answer
    x = 99,437.85

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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.