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Finding the Fourth Proportional to 779.51, 1,169.03 and 642.21

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Solution

The fourth proportional to 779.51, 1,169.03 and 642.21 is: 963.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.51 : 1,169.03 = 642.21 : x
  2. Step 2: Convert to fraction form
    779.51/1,169.03 = 642.21/x
  3. Step 3: Cross multiply
    779.51x = 1,169.03 × 642.21
  4. Step 4: Simplify right side
    779.51x = 750,761.95
  5. Step 5: Solve for x
    x = 750,761.95/779.51
  6. Step 6: Final answer
    x = 963.13

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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.