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Finding the Fourth Proportional to 18,985.80, 28,478.70 and 11,080.20

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Solution

The fourth proportional to 18,985.80, 28,478.70 and 11,080.20 is: 16,620.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,985.80 : 28,478.70 = 11,080.20 : x
  2. Step 2: Convert to fraction form
    18,985.80/28,478.70 = 11,080.20/x
  3. Step 3: Cross multiply
    18,985.80x = 28,478.70 × 11,080.20
  4. Step 4: Simplify right side
    18,985.80x = 315,549,691.74
  5. Step 5: Solve for x
    x = 315,549,691.74/18,985.80
  6. Step 6: Final answer
    x = 16,620.30

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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.