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Finding the Fourth Proportional to 15,730.88, 21,708.61 and 8,657.15

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Solution

The fourth proportional to 15,730.88, 21,708.61 and 8,657.15 is: 11,946.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,730.88 : 21,708.61 = 8,657.15 : x
  2. Step 2: Convert to fraction form
    15,730.88/21,708.61 = 8,657.15/x
  3. Step 3: Cross multiply
    15,730.88x = 21,708.61 × 8,657.15
  4. Step 4: Simplify right side
    15,730.88x = 187,934,562.88
  5. Step 5: Solve for x
    x = 187,934,562.88/15,730.88
  6. Step 6: Final answer
    x = 11,946.86

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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.