Home / 21,123.91-29,157.49-12,177.40

Finding the Fourth Proportional to 21,123.91, 29,157.49 and 12,177.40

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Solution

The fourth proportional to 21,123.91, 29,157.49 and 12,177.40 is: 16,808.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,123.91 : 29,157.49 = 12,177.40 : x
  2. Step 2: Convert to fraction form
    21,123.91/29,157.49 = 12,177.40/x
  3. Step 3: Cross multiply
    21,123.91x = 29,157.49 × 12,177.40
  4. Step 4: Simplify right side
    21,123.91x = 355,062,418.73
  5. Step 5: Solve for x
    x = 355,062,418.73/21,123.91
  6. Step 6: Final answer
    x = 16,808.56

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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.