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Finding the Fourth Proportional to 1,123.67, 1,685.52 and 421.04

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Solution

The fourth proportional to 1,123.67, 1,685.52 and 421.04 is: 631.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.67 : 1,685.52 = 421.04 : x
  2. Step 2: Convert to fraction form
    1,123.67/1,685.52 = 421.04/x
  3. Step 3: Cross multiply
    1,123.67x = 1,685.52 × 421.04
  4. Step 4: Simplify right side
    1,123.67x = 709,669.24
  5. Step 5: Solve for x
    x = 709,669.24/1,123.67
  6. Step 6: Final answer
    x = 631.56

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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.