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Finding the Fourth Proportional to 1,122.99, 1,684.51 and 429.70

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Solution

The fourth proportional to 1,122.99, 1,684.51 and 429.70 is: 644.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,122.99 : 1,684.51 = 429.70 : x
  2. Step 2: Convert to fraction form
    1,122.99/1,684.51 = 429.70/x
  3. Step 3: Cross multiply
    1,122.99x = 1,684.51 × 429.70
  4. Step 4: Simplify right side
    1,122.99x = 723,833.95
  5. Step 5: Solve for x
    x = 723,833.95/1,122.99
  6. Step 6: Final answer
    x = 644.56

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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.