Home / 31,425.71-43,379.01-20,818.76

Finding the Fourth Proportional to 31,425.71, 43,379.01 and 20,818.76

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Solution

The fourth proportional to 31,425.71, 43,379.01 and 20,818.76 is: 28,737.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,425.71 : 43,379.01 = 20,818.76 : x
  2. Step 2: Convert to fraction form
    31,425.71/43,379.01 = 20,818.76/x
  3. Step 3: Cross multiply
    31,425.71x = 43,379.01 × 20,818.76
  4. Step 4: Simplify right side
    31,425.71x = 903,096,981.33
  5. Step 5: Solve for x
    x = 903,096,981.33/31,425.71
  6. Step 6: Final answer
    x = 28,737.52

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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.