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Finding the Fourth Proportional to 1,123.20, 1,684.56 and 429.64

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Solution

The fourth proportional to 1,123.20, 1,684.56 and 429.64 is: 644.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.20 : 1,684.56 = 429.64 : x
  2. Step 2: Convert to fraction form
    1,123.20/1,684.56 = 429.64/x
  3. Step 3: Cross multiply
    1,123.20x = 1,684.56 × 429.64
  4. Step 4: Simplify right side
    1,123.20x = 723,751.76
  5. Step 5: Solve for x
    x = 723,751.76/1,123.20
  6. Step 6: Final answer
    x = 644.37

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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.