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Finding the Fourth Proportional to 8,807.64, 12,147.80 and 5,621.88

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Solution

The fourth proportional to 8,807.64, 12,147.80 and 5,621.88 is: 7,753.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,807.64 : 12,147.80 = 5,621.88 : x
  2. Step 2: Convert to fraction form
    8,807.64/12,147.80 = 5,621.88/x
  3. Step 3: Cross multiply
    8,807.64x = 12,147.80 × 5,621.88
  4. Step 4: Simplify right side
    8,807.64x = 68,293,473.86
  5. Step 5: Solve for x
    x = 68,293,473.86/8,807.64
  6. Step 6: Final answer
    x = 7,753.89

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.