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Finding the Fourth Proportional to 963.49, 1,329.61 and 521.39

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Solution

The fourth proportional to 963.49, 1,329.61 and 521.39 is: 719.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    963.49 : 1,329.61 = 521.39 : x
  2. Step 2: Convert to fraction form
    963.49/1,329.61 = 521.39/x
  3. Step 3: Cross multiply
    963.49x = 1,329.61 × 521.39
  4. Step 4: Simplify right side
    963.49x = 693,239.41
  5. Step 5: Solve for x
    x = 693,239.41/963.49
  6. Step 6: Final answer
    x = 719.51

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1.5x scale

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.