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Finding the Fourth Proportional to 1,143.20, 1,713.74 and 412.61

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Solution

The fourth proportional to 1,143.20, 1,713.74 and 412.61 is: 618.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.20 : 1,713.74 = 412.61 : x
  2. Step 2: Convert to fraction form
    1,143.20/1,713.74 = 412.61/x
  3. Step 3: Cross multiply
    1,143.20x = 1,713.74 × 412.61
  4. Step 4: Simplify right side
    1,143.20x = 707,095.63
  5. Step 5: Solve for x
    x = 707,095.63/1,143.20
  6. Step 6: Final answer
    x = 618.52

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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.