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Finding the Fourth Proportional to 8,689.24, 13,011.62 and 4,789.32

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Solution

The fourth proportional to 8,689.24, 13,011.62 and 4,789.32 is: 7,171.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,689.24 : 13,011.62 = 4,789.32 : x
  2. Step 2: Convert to fraction form
    8,689.24/13,011.62 = 4,789.32/x
  3. Step 3: Cross multiply
    8,689.24x = 13,011.62 × 4,789.32
  4. Step 4: Simplify right side
    8,689.24x = 62,316,811.90
  5. Step 5: Solve for x
    x = 62,316,811.90/8,689.24
  6. Step 6: Final answer
    x = 7,171.72

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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.