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Finding the Fourth Proportional to 18,891.20, 28,304.40 and 9,009.20

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Solution

The fourth proportional to 18,891.20, 28,304.40 and 9,009.20 is: 13,498.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,891.20 : 28,304.40 = 9,009.20 : x
  2. Step 2: Convert to fraction form
    18,891.20/28,304.40 = 9,009.20/x
  3. Step 3: Cross multiply
    18,891.20x = 28,304.40 × 9,009.20
  4. Step 4: Simplify right side
    18,891.20x = 255,000,000.48
  5. Step 5: Solve for x
    x = 255,000,000.48/18,891.20
  6. Step 6: Final answer
    x = 13,498.35

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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.