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Finding the Fourth Proportional to 72,658.40, 108,987.60 and 63,618.80

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Solution

The fourth proportional to 72,658.40, 108,987.60 and 63,618.80 is: 95,428.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,658.40 : 108,987.60 = 63,618.80 : x
  2. Step 2: Convert to fraction form
    72,658.40/108,987.60 = 63,618.80/x
  3. Step 3: Cross multiply
    72,658.40x = 108,987.60 × 63,618.80
  4. Step 4: Simplify right side
    72,658.40x = 6,933,660,326.88
  5. Step 5: Solve for x
    x = 6,933,660,326.88/72,658.40
  6. Step 6: Final answer
    x = 95,428.20

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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.