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Finding the Fourth Proportional to 782.76, 1,168.53 and 618.78

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Solution

The fourth proportional to 782.76, 1,168.53 and 618.78 is: 923.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.76 : 1,168.53 = 618.78 : x
  2. Step 2: Convert to fraction form
    782.76/1,168.53 = 618.78/x
  3. Step 3: Cross multiply
    782.76x = 1,168.53 × 618.78
  4. Step 4: Simplify right side
    782.76x = 723,062.99
  5. Step 5: Solve for x
    x = 723,062.99/782.76
  6. Step 6: Final answer
    x = 923.74

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.