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Finding the Fourth Proportional to 977.11, 1,349.31 and 628.41

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Solution

The fourth proportional to 977.11, 1,349.31 and 628.41 is: 867.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.11 : 1,349.31 = 628.41 : x
  2. Step 2: Convert to fraction form
    977.11/1,349.31 = 628.41/x
  3. Step 3: Cross multiply
    977.11x = 1,349.31 × 628.41
  4. Step 4: Simplify right side
    977.11x = 847,919.90
  5. Step 5: Solve for x
    x = 847,919.90/977.11
  6. Step 6: Final answer
    x = 867.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.