Home / 21,123.78-29,158.10-12,174.84

Finding the Fourth Proportional to 21,123.78, 29,158.10 and 12,174.84

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Solution

The fourth proportional to 21,123.78, 29,158.10 and 12,174.84 is: 16,805.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,123.78 : 29,158.10 = 12,174.84 : x
  2. Step 2: Convert to fraction form
    21,123.78/29,158.10 = 12,174.84/x
  3. Step 3: Cross multiply
    21,123.78x = 29,158.10 × 12,174.84
  4. Step 4: Simplify right side
    21,123.78x = 354,995,202.20
  5. Step 5: Solve for x
    x = 354,995,202.20/21,123.78
  6. Step 6: Final answer
    x = 16,805.48

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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.