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Finding the Fourth Proportional to 103,757.15, 155,775.65 and 66,390.16

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Solution

The fourth proportional to 103,757.15, 155,775.65 and 66,390.16 is: 99,674.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,757.15 : 155,775.65 = 66,390.16 : x
  2. Step 2: Convert to fraction form
    103,757.15/155,775.65 = 66,390.16/x
  3. Step 3: Cross multiply
    103,757.15x = 155,775.65 × 66,390.16
  4. Step 4: Simplify right side
    103,757.15x = 10,341,969,216.78
  5. Step 5: Solve for x
    x = 10,341,969,216.78/103,757.15
  6. Step 6: Final answer
    x = 99,674.77

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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.