Home / 20,700.18-28,550.84-13,139.96

Finding the Fourth Proportional to 20,700.18, 28,550.84 and 13,139.96

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Solution

The fourth proportional to 20,700.18, 28,550.84 and 13,139.96 is: 18,123.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,700.18 : 28,550.84 = 13,139.96 : x
  2. Step 2: Convert to fraction form
    20,700.18/28,550.84 = 13,139.96/x
  3. Step 3: Cross multiply
    20,700.18x = 28,550.84 × 13,139.96
  4. Step 4: Simplify right side
    20,700.18x = 375,156,687.11
  5. Step 5: Solve for x
    x = 375,156,687.11/20,700.18
  6. Step 6: Final answer
    x = 18,123.35

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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.