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Finding the Fourth Proportional to 42,642.60, 63,963.90 and 20,444.55

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Solution

The fourth proportional to 42,642.60, 63,963.90 and 20,444.55 is: 30,666.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,642.60 : 63,963.90 = 20,444.55 : x
  2. Step 2: Convert to fraction form
    42,642.60/63,963.90 = 20,444.55/x
  3. Step 3: Cross multiply
    42,642.60x = 63,963.90 × 20,444.55
  4. Step 4: Simplify right side
    42,642.60x = 1,307,713,151.75
  5. Step 5: Solve for x
    x = 1,307,713,151.75/42,642.60
  6. Step 6: Final answer
    x = 30,666.83

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1.5x scale

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.