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Finding the Fourth Proportional to 677.71, 1,015.80 and 266.77

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Solution

The fourth proportional to 677.71, 1,015.80 and 266.77 is: 399.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    677.71 : 1,015.80 = 266.77 : x
  2. Step 2: Convert to fraction form
    677.71/1,015.80 = 266.77/x
  3. Step 3: Cross multiply
    677.71x = 1,015.80 × 266.77
  4. Step 4: Simplify right side
    677.71x = 270,984.97
  5. Step 5: Solve for x
    x = 270,984.97/677.71
  6. Step 6: Final answer
    x = 399.85

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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.