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Finding the Fourth Proportional to 8,718.60, 12,031.75 and 4,739.72

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Solution

The fourth proportional to 8,718.60, 12,031.75 and 4,739.72 is: 6,540.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,718.60 : 12,031.75 = 4,739.72 : x
  2. Step 2: Convert to fraction form
    8,718.60/12,031.75 = 4,739.72/x
  3. Step 3: Cross multiply
    8,718.60x = 12,031.75 × 4,739.72
  4. Step 4: Simplify right side
    8,718.60x = 57,027,084.18
  5. Step 5: Solve for x
    x = 57,027,084.18/8,718.60
  6. Step 6: Final answer
    x = 6,540.85

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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.