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Finding the Fourth Proportional to 1,145.70, 1,717.20 and 414.81

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Solution

The fourth proportional to 1,145.70, 1,717.20 and 414.81 is: 621.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.70 : 1,717.20 = 414.81 : x
  2. Step 2: Convert to fraction form
    1,145.70/1,717.20 = 414.81/x
  3. Step 3: Cross multiply
    1,145.70x = 1,717.20 × 414.81
  4. Step 4: Simplify right side
    1,145.70x = 712,311.73
  5. Step 5: Solve for x
    x = 712,311.73/1,145.70
  6. Step 6: Final answer
    x = 621.73

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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.