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Finding the Fourth Proportional to 18,987.20, 28,480.80 and 8,457.20

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Solution

The fourth proportional to 18,987.20, 28,480.80 and 8,457.20 is: 12,685.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,987.20 : 28,480.80 = 8,457.20 : x
  2. Step 2: Convert to fraction form
    18,987.20/28,480.80 = 8,457.20/x
  3. Step 3: Cross multiply
    18,987.20x = 28,480.80 × 8,457.20
  4. Step 4: Simplify right side
    18,987.20x = 240,867,821.76
  5. Step 5: Solve for x
    x = 240,867,821.76/18,987.20
  6. Step 6: Final answer
    x = 12,685.80

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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.