Home / 21,127.40-29,156.50-12,174.20

Finding the Fourth Proportional to 21,127.40, 29,156.50 and 12,174.20

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Solution

The fourth proportional to 21,127.40, 29,156.50 and 12,174.20 is: 16,800.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,127.40 : 29,156.50 = 12,174.20 : x
  2. Step 2: Convert to fraction form
    21,127.40/29,156.50 = 12,174.20/x
  3. Step 3: Cross multiply
    21,127.40x = 29,156.50 × 12,174.20
  4. Step 4: Simplify right side
    21,127.40x = 354,957,062.30
  5. Step 5: Solve for x
    x = 354,957,062.30/21,127.40
  6. Step 6: Final answer
    x = 16,800.79

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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.