Home / 20,938.96-31,407.95-5,143.97

Finding the Fourth Proportional to 20,938.96, 31,407.95 and 5,143.97

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Solution

The fourth proportional to 20,938.96, 31,407.95 and 5,143.97 is: 7,715.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,938.96 : 31,407.95 = 5,143.97 : x
  2. Step 2: Convert to fraction form
    20,938.96/31,407.95 = 5,143.97/x
  3. Step 3: Cross multiply
    20,938.96x = 31,407.95 × 5,143.97
  4. Step 4: Simplify right side
    20,938.96x = 161,561,474.04
  5. Step 5: Solve for x
    x = 161,561,474.04/20,938.96
  6. Step 6: Final answer
    x = 7,715.83

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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.