Home / 1,122.24-1,684.11-429.49

Finding the Fourth Proportional to 1,122.24, 1,684.11 and 429.49

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Solution

The fourth proportional to 1,122.24, 1,684.11 and 429.49 is: 644.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,122.24 : 1,684.11 = 429.49 : x
  2. Step 2: Convert to fraction form
    1,122.24/1,684.11 = 429.49/x
  3. Step 3: Cross multiply
    1,122.24x = 1,684.11 × 429.49
  4. Step 4: Simplify right side
    1,122.24x = 723,308.40
  5. Step 5: Solve for x
    x = 723,308.40/1,122.24
  6. Step 6: Final answer
    x = 644.52

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Double scale
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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.