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Finding the Fourth Proportional to 40,987.20, 61,480.80 and 40,209.60

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Solution

The fourth proportional to 40,987.20, 61,480.80 and 40,209.60 is: 60,314.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,987.20 : 61,480.80 = 40,209.60 : x
  2. Step 2: Convert to fraction form
    40,987.20/61,480.80 = 40,209.60/x
  3. Step 3: Cross multiply
    40,987.20x = 61,480.80 × 40,209.60
  4. Step 4: Simplify right side
    40,987.20x = 2,472,118,375.68
  5. Step 5: Solve for x
    x = 2,472,118,375.68/40,987.20
  6. Step 6: Final answer
    x = 60,314.40

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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.