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Finding the Fourth Proportional to 31,811.80, 47,717.70 and 18,689.80

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Solution

The fourth proportional to 31,811.80, 47,717.70 and 18,689.80 is: 28,034.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,811.80 : 47,717.70 = 18,689.80 : x
  2. Step 2: Convert to fraction form
    31,811.80/47,717.70 = 18,689.80/x
  3. Step 3: Cross multiply
    31,811.80x = 47,717.70 × 18,689.80
  4. Step 4: Simplify right side
    31,811.80x = 891,834,269.46
  5. Step 5: Solve for x
    x = 891,834,269.46/31,811.80
  6. Step 6: Final answer
    x = 28,034.70

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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.