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Finding the Fourth Proportional to 1,123.42, 1,685.10 and 393

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Solution

The fourth proportional to 1,123.42, 1,685.10 and 393 is: 589.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.42 : 1,685.10 = 393 : x
  2. Step 2: Convert to fraction form
    1,123.42/1,685.10 = 393/x
  3. Step 3: Cross multiply
    1,123.42x = 1,685.10 × 393
  4. Step 4: Simplify right side
    1,123.42x = 662,244.30
  5. Step 5: Solve for x
    x = 662,244.30/1,123.42
  6. Step 6: Final answer
    x = 589.49

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Double scale
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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.