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Finding the Fourth Proportional to 1,123.75, 1,685.17 and 393.08

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Solution

The fourth proportional to 1,123.75, 1,685.17 and 393.08 is: 589.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.75 : 1,685.17 = 393.08 : x
  2. Step 2: Convert to fraction form
    1,123.75/1,685.17 = 393.08/x
  3. Step 3: Cross multiply
    1,123.75x = 1,685.17 × 393.08
  4. Step 4: Simplify right side
    1,123.75x = 662,406.62
  5. Step 5: Solve for x
    x = 662,406.62/1,123.75
  6. Step 6: Final answer
    x = 589.46

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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.