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Finding the Fourth Proportional to 677.16, 1,015.80 and 266.49

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Solution

The fourth proportional to 677.16, 1,015.80 and 266.49 is: 399.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    677.16 : 1,015.80 = 266.49 : x
  2. Step 2: Convert to fraction form
    677.16/1,015.80 = 266.49/x
  3. Step 3: Cross multiply
    677.16x = 1,015.80 × 266.49
  4. Step 4: Simplify right side
    677.16x = 270,700.54
  5. Step 5: Solve for x
    x = 270,700.54/677.16
  6. Step 6: Final answer
    x = 399.76

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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.