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Finding the Fourth Proportional to 763.83, 1,145.18 and 243.53

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Solution

The fourth proportional to 763.83, 1,145.18 and 243.53 is: 365.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.83 : 1,145.18 = 243.53 : x
  2. Step 2: Convert to fraction form
    763.83/1,145.18 = 243.53/x
  3. Step 3: Cross multiply
    763.83x = 1,145.18 × 243.53
  4. Step 4: Simplify right side
    763.83x = 278,887.88
  5. Step 5: Solve for x
    x = 278,887.88/763.83
  6. Step 6: Final answer
    x = 365.12

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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.