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Finding the Fourth Proportional to 963.16, 1,328.67 and 631.60

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Solution

The fourth proportional to 963.16, 1,328.67 and 631.60 is: 871.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    963.16 : 1,328.67 = 631.60 : x
  2. Step 2: Convert to fraction form
    963.16/1,328.67 = 631.60/x
  3. Step 3: Cross multiply
    963.16x = 1,328.67 × 631.60
  4. Step 4: Simplify right side
    963.16x = 839,184.65
  5. Step 5: Solve for x
    x = 839,184.65/963.16
  6. Step 6: Final answer
    x = 871.28

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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.