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Finding the Fourth Proportional to 8,639.68, 11,926.80 and 5,655.64

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Solution

The fourth proportional to 8,639.68, 11,926.80 and 5,655.64 is: 7,807.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,639.68 : 11,926.80 = 5,655.64 : x
  2. Step 2: Convert to fraction form
    8,639.68/11,926.80 = 5,655.64/x
  3. Step 3: Cross multiply
    8,639.68x = 11,926.80 × 5,655.64
  4. Step 4: Simplify right side
    8,639.68x = 67,453,687.15
  5. Step 5: Solve for x
    x = 67,453,687.15/8,639.68
  6. Step 6: Final answer
    x = 7,807.43

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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.