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Finding the Fourth Proportional to 66,180.80, 99,141.60 and 39,807.20

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Solution

The fourth proportional to 66,180.80, 99,141.60 and 39,807.20 is: 59,632.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,180.80 : 99,141.60 = 39,807.20 : x
  2. Step 2: Convert to fraction form
    66,180.80/99,141.60 = 39,807.20/x
  3. Step 3: Cross multiply
    66,180.80x = 99,141.60 × 39,807.20
  4. Step 4: Simplify right side
    66,180.80x = 3,946,549,499.52
  5. Step 5: Solve for x
    x = 3,946,549,499.52/66,180.80
  6. Step 6: Final answer
    x = 59,632.85

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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.