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Finding the Fourth Proportional to 1,123.23, 1,685.12 and 392.81

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Solution

The fourth proportional to 1,123.23, 1,685.12 and 392.81 is: 589.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.23 : 1,685.12 = 392.81 : x
  2. Step 2: Convert to fraction form
    1,123.23/1,685.12 = 392.81/x
  3. Step 3: Cross multiply
    1,123.23x = 1,685.12 × 392.81
  4. Step 4: Simplify right side
    1,123.23x = 661,921.60
  5. Step 5: Solve for x
    x = 661,921.60/1,123.23
  6. Step 6: Final answer
    x = 589.30

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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.