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Finding the Fourth Proportional to 103,758.65, 155,777.90 and 66,391.66

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Solution

The fourth proportional to 103,758.65, 155,777.90 and 66,391.66 is: 99,677.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,758.65 : 155,777.90 = 66,391.66 : x
  2. Step 2: Convert to fraction form
    103,758.65/155,777.90 = 66,391.66/x
  3. Step 3: Cross multiply
    103,758.65x = 155,777.90 × 66,391.66
  4. Step 4: Simplify right side
    103,758.65x = 10,342,353,372.31
  5. Step 5: Solve for x
    x = 10,342,353,372.31/103,758.65
  6. Step 6: Final answer
    x = 99,677.02

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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.