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Finding the Fourth Proportional to 8,624.88, 11,905.20 and 5,642.64

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Solution

The fourth proportional to 8,624.88, 11,905.20 and 5,642.64 is: 7,788.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,624.88 : 11,905.20 = 5,642.64 : x
  2. Step 2: Convert to fraction form
    8,624.88/11,905.20 = 5,642.64/x
  3. Step 3: Cross multiply
    8,624.88x = 11,905.20 × 5,642.64
  4. Step 4: Simplify right side
    8,624.88x = 67,176,757.73
  5. Step 5: Solve for x
    x = 67,176,757.73/8,624.88
  6. Step 6: Final answer
    x = 7,788.72

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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.