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Finding the Fourth Proportional to 1,123.68, 1,685.68 and 393.04

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Solution

The fourth proportional to 1,123.68, 1,685.68 and 393.04 is: 589.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.68 : 1,685.68 = 393.04 : x
  2. Step 2: Convert to fraction form
    1,123.68/1,685.68 = 393.04/x
  3. Step 3: Cross multiply
    1,123.68x = 1,685.68 × 393.04
  4. Step 4: Simplify right side
    1,123.68x = 662,539.67
  5. Step 5: Solve for x
    x = 662,539.67/1,123.68
  6. Step 6: Final answer
    x = 589.62

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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.