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Finding the Fourth Proportional to 9,991.20, 15,019.20 and 8,565.60

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Solution

The fourth proportional to 9,991.20, 15,019.20 and 8,565.60 is: 12,876.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,991.20 : 15,019.20 = 8,565.60 : x
  2. Step 2: Convert to fraction form
    9,991.20/15,019.20 = 8,565.60/x
  3. Step 3: Cross multiply
    9,991.20x = 15,019.20 × 8,565.60
  4. Step 4: Simplify right side
    9,991.20x = 128,648,459.52
  5. Step 5: Solve for x
    x = 128,648,459.52/9,991.20
  6. Step 6: Final answer
    x = 12,876.18

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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.