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Finding the Fourth Proportional to 677.07, 1,015.92 and 287.28

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Solution

The fourth proportional to 677.07, 1,015.92 and 287.28 is: 431.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    677.07 : 1,015.92 = 287.28 : x
  2. Step 2: Convert to fraction form
    677.07/1,015.92 = 287.28/x
  3. Step 3: Cross multiply
    677.07x = 1,015.92 × 287.28
  4. Step 4: Simplify right side
    677.07x = 291,853.50
  5. Step 5: Solve for x
    x = 291,853.50/677.07
  6. Step 6: Final answer
    x = 431.05

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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.