Home / 31,871.88-47,764.78-12,139.68

Finding the Fourth Proportional to 31,871.88, 47,764.78 and 12,139.68

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Solution

The fourth proportional to 31,871.88, 47,764.78 and 12,139.68 is: 18,193.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,871.88 : 47,764.78 = 12,139.68 : x
  2. Step 2: Convert to fraction form
    31,871.88/47,764.78 = 12,139.68/x
  3. Step 3: Cross multiply
    31,871.88x = 47,764.78 × 12,139.68
  4. Step 4: Simplify right side
    31,871.88x = 579,849,144.47
  5. Step 5: Solve for x
    x = 579,849,144.47/31,871.88
  6. Step 6: Final answer
    x = 18,193.13

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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.