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Finding the Fourth Proportional to 1,123.86, 1,685.81 and 393.46

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Solution

The fourth proportional to 1,123.86, 1,685.81 and 393.46 is: 590.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.86 : 1,685.81 = 393.46 : x
  2. Step 2: Convert to fraction form
    1,123.86/1,685.81 = 393.46/x
  3. Step 3: Cross multiply
    1,123.86x = 1,685.81 × 393.46
  4. Step 4: Simplify right side
    1,123.86x = 663,298.80
  5. Step 5: Solve for x
    x = 663,298.80/1,123.86
  6. Step 6: Final answer
    x = 590.20

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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.