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Finding the Fourth Proportional to 963.68, 1,329.86 and 521.57

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Solution

The fourth proportional to 963.68, 1,329.86 and 521.57 is: 719.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    963.68 : 1,329.86 = 521.57 : x
  2. Step 2: Convert to fraction form
    963.68/1,329.86 = 521.57/x
  3. Step 3: Cross multiply
    963.68x = 1,329.86 × 521.57
  4. Step 4: Simplify right side
    963.68x = 693,605.82
  5. Step 5: Solve for x
    x = 693,605.82/963.68
  6. Step 6: Final answer
    x = 719.75

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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.