Home / 21,517.76-29,686.20-15,865.89

Finding the Fourth Proportional to 21,517.76, 29,686.20 and 15,865.89

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Solution

The fourth proportional to 21,517.76, 29,686.20 and 15,865.89 is: 21,888.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,517.76 : 29,686.20 = 15,865.89 : x
  2. Step 2: Convert to fraction form
    21,517.76/29,686.20 = 15,865.89/x
  3. Step 3: Cross multiply
    21,517.76x = 29,686.20 × 15,865.89
  4. Step 4: Simplify right side
    21,517.76x = 470,997,812.90
  5. Step 5: Solve for x
    x = 470,997,812.90/21,517.76
  6. Step 6: Final answer
    x = 21,888.79

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1.5x scale

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.