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Finding the Fourth Proportional to 779.96, 1,171.38 and 618.68

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Solution

The fourth proportional to 779.96, 1,171.38 and 618.68 is: 929.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.96 : 1,171.38 = 618.68 : x
  2. Step 2: Convert to fraction form
    779.96/1,171.38 = 618.68/x
  3. Step 3: Cross multiply
    779.96x = 1,171.38 × 618.68
  4. Step 4: Simplify right side
    779.96x = 724,709.38
  5. Step 5: Solve for x
    x = 724,709.38/779.96
  6. Step 6: Final answer
    x = 929.16

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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.