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Finding the Fourth Proportional to 766.13, 1,146.45 and 663.76

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Solution

The fourth proportional to 766.13, 1,146.45 and 663.76 is: 993.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.13 : 1,146.45 = 663.76 : x
  2. Step 2: Convert to fraction form
    766.13/1,146.45 = 663.76/x
  3. Step 3: Cross multiply
    766.13x = 1,146.45 × 663.76
  4. Step 4: Simplify right side
    766.13x = 760,969.31
  5. Step 5: Solve for x
    x = 760,969.31/766.13
  6. Step 6: Final answer
    x = 993.27

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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.