Home / 20,988.38-31,463.12-7,830.74

Finding the Fourth Proportional to 20,988.38, 31,463.12 and 7,830.74

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Solution

The fourth proportional to 20,988.38, 31,463.12 and 7,830.74 is: 11,738.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,988.38 : 31,463.12 = 7,830.74 : x
  2. Step 2: Convert to fraction form
    20,988.38/31,463.12 = 7,830.74/x
  3. Step 3: Cross multiply
    20,988.38x = 31,463.12 × 7,830.74
  4. Step 4: Simplify right side
    20,988.38x = 246,379,512.31
  5. Step 5: Solve for x
    x = 246,379,512.31/20,988.38
  6. Step 6: Final answer
    x = 11,738.85

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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.