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Finding the Fourth Proportional to 963.77, 1,330 and 521.68

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Solution

The fourth proportional to 963.77, 1,330 and 521.68 is: 719.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    963.77 : 1,330 = 521.68 : x
  2. Step 2: Convert to fraction form
    963.77/1,330 = 521.68/x
  3. Step 3: Cross multiply
    963.77x = 1,330 × 521.68
  4. Step 4: Simplify right side
    963.77x = 693,834.40
  5. Step 5: Solve for x
    x = 693,834.40/963.77
  6. Step 6: Final answer
    x = 719.92

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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.