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Finding the Fourth Proportional to 1,123.50, 1,685.17 and 393.13

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Solution

The fourth proportional to 1,123.50, 1,685.17 and 393.13 is: 589.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.50 : 1,685.17 = 393.13 : x
  2. Step 2: Convert to fraction form
    1,123.50/1,685.17 = 393.13/x
  3. Step 3: Cross multiply
    1,123.50x = 1,685.17 × 393.13
  4. Step 4: Simplify right side
    1,123.50x = 662,480.49
  5. Step 5: Solve for x
    x = 662,480.49/1,123.50
  6. Step 6: Final answer
    x = 589.66

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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.