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Finding the Fourth Proportional to 42,700.80, 63,905.40 and 39,201.60

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Solution

The fourth proportional to 42,700.80, 63,905.40 and 39,201.60 is: 58,668.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,700.80 : 63,905.40 = 39,201.60 : x
  2. Step 2: Convert to fraction form
    42,700.80/63,905.40 = 39,201.60/x
  3. Step 3: Cross multiply
    42,700.80x = 63,905.40 × 39,201.60
  4. Step 4: Simplify right side
    42,700.80x = 2,505,193,928.64
  5. Step 5: Solve for x
    x = 2,505,193,928.64/42,700.80
  6. Step 6: Final answer
    x = 58,668.55

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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.