Home / 3,123.20-4,684.85-931.95

Finding the Fourth Proportional to 3,123.20, 4,684.85 and 931.95

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Solution

The fourth proportional to 3,123.20, 4,684.85 and 931.95 is: 1,397.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,123.20 : 4,684.85 = 931.95 : x
  2. Step 2: Convert to fraction form
    3,123.20/4,684.85 = 931.95/x
  3. Step 3: Cross multiply
    3,123.20x = 4,684.85 × 931.95
  4. Step 4: Simplify right side
    3,123.20x = 4,366,045.96
  5. Step 5: Solve for x
    x = 4,366,045.96/3,123.20
  6. Step 6: Final answer
    x = 1,397.94

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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.