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Finding the Fourth Proportional to 18,720.60, 28,080.90 and 8,879.10

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Solution

The fourth proportional to 18,720.60, 28,080.90 and 8,879.10 is: 13,318.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,720.60 : 28,080.90 = 8,879.10 : x
  2. Step 2: Convert to fraction form
    18,720.60/28,080.90 = 8,879.10/x
  3. Step 3: Cross multiply
    18,720.60x = 28,080.90 × 8,879.10
  4. Step 4: Simplify right side
    18,720.60x = 249,333,119.19
  5. Step 5: Solve for x
    x = 249,333,119.19/18,720.60
  6. Step 6: Final answer
    x = 13,318.65

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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.