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Finding the Fourth Proportional to 963.62, 1,329.81 and 521.53

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Solution

The fourth proportional to 963.62, 1,329.81 and 521.53 is: 719.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    963.62 : 1,329.81 = 521.53 : x
  2. Step 2: Convert to fraction form
    963.62/1,329.81 = 521.53/x
  3. Step 3: Cross multiply
    963.62x = 1,329.81 × 521.53
  4. Step 4: Simplify right side
    963.62x = 693,537.25
  5. Step 5: Solve for x
    x = 693,537.25/963.62
  6. Step 6: Final answer
    x = 719.72

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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.