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Finding the Fourth Proportional to 1,123.11, 1,684.29 and 429.24

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Solution

The fourth proportional to 1,123.11, 1,684.29 and 429.24 is: 643.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.11 : 1,684.29 = 429.24 : x
  2. Step 2: Convert to fraction form
    1,123.11/1,684.29 = 429.24/x
  3. Step 3: Cross multiply
    1,123.11x = 1,684.29 × 429.24
  4. Step 4: Simplify right side
    1,123.11x = 722,964.64
  5. Step 5: Solve for x
    x = 722,964.64/1,123.11
  6. Step 6: Final answer
    x = 643.72

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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.