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Finding the Fourth Proportional to 763.66, 1,146.56 and 393.78

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Solution

The fourth proportional to 763.66, 1,146.56 and 393.78 is: 591.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.66 : 1,146.56 = 393.78 : x
  2. Step 2: Convert to fraction form
    763.66/1,146.56 = 393.78/x
  3. Step 3: Cross multiply
    763.66x = 1,146.56 × 393.78
  4. Step 4: Simplify right side
    763.66x = 451,492.40
  5. Step 5: Solve for x
    x = 451,492.40/763.66
  6. Step 6: Final answer
    x = 591.22

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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.