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Finding the Fourth Proportional to 743.19, 1,108.24 and 691.25

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Solution

The fourth proportional to 743.19, 1,108.24 and 691.25 is: 1,030.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.19 : 1,108.24 = 691.25 : x
  2. Step 2: Convert to fraction form
    743.19/1,108.24 = 691.25/x
  3. Step 3: Cross multiply
    743.19x = 1,108.24 × 691.25
  4. Step 4: Simplify right side
    743.19x = 766,063.63
  5. Step 5: Solve for x
    x = 766,063.63/743.19
  6. Step 6: Final answer
    x = 1,030.78

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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.