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Finding the Fourth Proportional to 875.19, 1,310.73 and 691.36

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Solution

The fourth proportional to 875.19, 1,310.73 and 691.36 is: 1,035.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.19 : 1,310.73 = 691.36 : x
  2. Step 2: Convert to fraction form
    875.19/1,310.73 = 691.36/x
  3. Step 3: Cross multiply
    875.19x = 1,310.73 × 691.36
  4. Step 4: Simplify right side
    875.19x = 906,186.29
  5. Step 5: Solve for x
    x = 906,186.29/875.19
  6. Step 6: Final answer
    x = 1,035.42

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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.