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Finding the Fourth Proportional to 964.85, 1,331.28 and 628.83

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Solution

The fourth proportional to 964.85, 1,331.28 and 628.83 is: 867.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    964.85 : 1,331.28 = 628.83 : x
  2. Step 2: Convert to fraction form
    964.85/1,331.28 = 628.83/x
  3. Step 3: Cross multiply
    964.85x = 1,331.28 × 628.83
  4. Step 4: Simplify right side
    964.85x = 837,148.80
  5. Step 5: Solve for x
    x = 837,148.80/964.85
  6. Step 6: Final answer
    x = 867.65

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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.