Home / 20,833.18-31,248.78-12,515.56

Finding the Fourth Proportional to 20,833.18, 31,248.78 and 12,515.56

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Solution

The fourth proportional to 20,833.18, 31,248.78 and 12,515.56 is: 18,772.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,833.18 : 31,248.78 = 12,515.56 : x
  2. Step 2: Convert to fraction form
    20,833.18/31,248.78 = 12,515.56/x
  3. Step 3: Cross multiply
    20,833.18x = 31,248.78 × 12,515.56
  4. Step 4: Simplify right side
    20,833.18x = 391,095,981.02
  5. Step 5: Solve for x
    x = 391,095,981.02/20,833.18
  6. Step 6: Final answer
    x = 18,772.75

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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.