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Finding the Fourth Proportional to 142,642.60, 213,963.90 and 72,658.60

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Solution

The fourth proportional to 142,642.60, 213,963.90 and 72,658.60 is: 108,987.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,642.60 : 213,963.90 = 72,658.60 : x
  2. Step 2: Convert to fraction form
    142,642.60/213,963.90 = 72,658.60/x
  3. Step 3: Cross multiply
    142,642.60x = 213,963.90 × 72,658.60
  4. Step 4: Simplify right side
    142,642.60x = 15,546,317,424.54
  5. Step 5: Solve for x
    x = 15,546,317,424.54/142,642.60
  6. Step 6: Final answer
    x = 108,987.90

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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.