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Finding the Fourth Proportional to 10,484.64, 15,729.12 and 8,765.28

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Solution

The fourth proportional to 10,484.64, 15,729.12 and 8,765.28 is: 13,149.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,484.64 : 15,729.12 = 8,765.28 : x
  2. Step 2: Convert to fraction form
    10,484.64/15,729.12 = 8,765.28/x
  3. Step 3: Cross multiply
    10,484.64x = 15,729.12 × 8,765.28
  4. Step 4: Simplify right side
    10,484.64x = 137,870,140.95
  5. Step 5: Solve for x
    x = 137,870,140.95/10,484.64
  6. Step 6: Final answer
    x = 13,149.73

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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.