Home / 21,390.57-29,517.35-11,957.85

Finding the Fourth Proportional to 21,390.57, 29,517.35 and 11,957.85

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Solution

The fourth proportional to 21,390.57, 29,517.35 and 11,957.85 is: 16,500.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,390.57 : 29,517.35 = 11,957.85 : x
  2. Step 2: Convert to fraction form
    21,390.57/29,517.35 = 11,957.85/x
  3. Step 3: Cross multiply
    21,390.57x = 29,517.35 × 11,957.85
  4. Step 4: Simplify right side
    21,390.57x = 352,963,983.91
  5. Step 5: Solve for x
    x = 352,963,983.91/21,390.57
  6. Step 6: Final answer
    x = 16,500.92

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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.