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Finding the Fourth Proportional to 1,123.77, 1,685.96 and 393.36

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Solution

The fourth proportional to 1,123.77, 1,685.96 and 393.36 is: 590.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.77 : 1,685.96 = 393.36 : x
  2. Step 2: Convert to fraction form
    1,123.77/1,685.96 = 393.36/x
  3. Step 3: Cross multiply
    1,123.77x = 1,685.96 × 393.36
  4. Step 4: Simplify right side
    1,123.77x = 663,184.62
  5. Step 5: Solve for x
    x = 663,184.62/1,123.77
  6. Step 6: Final answer
    x = 590.14

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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.