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Finding the Fourth Proportional to 8,712.31, 13,068.95 and 2,789.71

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Solution

The fourth proportional to 8,712.31, 13,068.95 and 2,789.71 is: 4,184.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,712.31 : 13,068.95 = 2,789.71 : x
  2. Step 2: Convert to fraction form
    8,712.31/13,068.95 = 2,789.71/x
  3. Step 3: Cross multiply
    8,712.31x = 13,068.95 × 2,789.71
  4. Step 4: Simplify right side
    8,712.31x = 36,458,599.23
  5. Step 5: Solve for x
    x = 36,458,599.23/8,712.31
  6. Step 6: Final answer
    x = 4,184.72

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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.