Home / 20,918.61-31,377.70-5,123.71

Finding the Fourth Proportional to 20,918.61, 31,377.70 and 5,123.71

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Solution

The fourth proportional to 20,918.61, 31,377.70 and 5,123.71 is: 7,685.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,918.61 : 31,377.70 = 5,123.71 : x
  2. Step 2: Convert to fraction form
    20,918.61/31,377.70 = 5,123.71/x
  3. Step 3: Cross multiply
    20,918.61x = 31,377.70 × 5,123.71
  4. Step 4: Simplify right side
    20,918.61x = 160,770,052.76
  5. Step 5: Solve for x
    x = 160,770,052.76/20,918.61
  6. Step 6: Final answer
    x = 7,685.51

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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.