Home / 20,972.57-31,456.46-9,123.89

Finding the Fourth Proportional to 20,972.57, 31,456.46 and 9,123.89

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Solution

The fourth proportional to 20,972.57, 31,456.46 and 9,123.89 is: 13,684.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,972.57 : 31,456.46 = 9,123.89 : x
  2. Step 2: Convert to fraction form
    20,972.57/31,456.46 = 9,123.89/x
  3. Step 3: Cross multiply
    20,972.57x = 31,456.46 × 9,123.89
  4. Step 4: Simplify right side
    20,972.57x = 287,005,235.21
  5. Step 5: Solve for x
    x = 287,005,235.21/20,972.57
  6. Step 6: Final answer
    x = 13,684.79

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.