Home / 20,781.35-31,174.76-7,642.95

Finding the Fourth Proportional to 20,781.35, 31,174.76 and 7,642.95

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Solution

The fourth proportional to 20,781.35, 31,174.76 and 7,642.95 is: 11,465.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,781.35 : 31,174.76 = 7,642.95 : x
  2. Step 2: Convert to fraction form
    20,781.35/31,174.76 = 7,642.95/x
  3. Step 3: Cross multiply
    20,781.35x = 31,174.76 × 7,642.95
  4. Step 4: Simplify right side
    20,781.35x = 238,267,131.94
  5. Step 5: Solve for x
    x = 238,267,131.94/20,781.35
  6. Step 6: Final answer
    x = 11,465.43

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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.