Home / 31,418.50-47,115.78-13,878.76

Finding the Fourth Proportional to 31,418.50, 47,115.78 and 13,878.76

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Solution

The fourth proportional to 31,418.50, 47,115.78 and 13,878.76 is: 20,812.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,418.50 : 47,115.78 = 13,878.76 : x
  2. Step 2: Convert to fraction form
    31,418.50/47,115.78 = 13,878.76/x
  3. Step 3: Cross multiply
    31,418.50x = 47,115.78 × 13,878.76
  4. Step 4: Simplify right side
    31,418.50x = 653,908,602.83
  5. Step 5: Solve for x
    x = 653,908,602.83/31,418.50
  6. Step 6: Final answer
    x = 20,812.85

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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.