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Finding the Fourth Proportional to 763.06, 1,143.90 and 398.10

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Solution

The fourth proportional to 763.06, 1,143.90 and 398.10 is: 596.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.06 : 1,143.90 = 398.10 : x
  2. Step 2: Convert to fraction form
    763.06/1,143.90 = 398.10/x
  3. Step 3: Cross multiply
    763.06x = 1,143.90 × 398.10
  4. Step 4: Simplify right side
    763.06x = 455,386.59
  5. Step 5: Solve for x
    x = 455,386.59/763.06
  6. Step 6: Final answer
    x = 596.79

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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.