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Finding the Fourth Proportional to 677.29, 1,016.20 and 287.37

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Solution

The fourth proportional to 677.29, 1,016.20 and 287.37 is: 431.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    677.29 : 1,016.20 = 287.37 : x
  2. Step 2: Convert to fraction form
    677.29/1,016.20 = 287.37/x
  3. Step 3: Cross multiply
    677.29x = 1,016.20 × 287.37
  4. Step 4: Simplify right side
    677.29x = 292,023.96
  5. Step 5: Solve for x
    x = 292,023.96/677.29
  6. Step 6: Final answer
    x = 431.17

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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.