Home / 1,123.30-1,685.13-392.68

Finding the Fourth Proportional to 1,123.30, 1,685.13 and 392.68

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Solution

The fourth proportional to 1,123.30, 1,685.13 and 392.68 is: 589.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.30 : 1,685.13 = 392.68 : x
  2. Step 2: Convert to fraction form
    1,123.30/1,685.13 = 392.68/x
  3. Step 3: Cross multiply
    1,123.30x = 1,685.13 × 392.68
  4. Step 4: Simplify right side
    1,123.30x = 661,716.85
  5. Step 5: Solve for x
    x = 661,716.85/1,123.30
  6. Step 6: Final answer
    x = 589.08

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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.