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Finding the Fourth Proportional to 959, 1,321.36 and 663.76

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Solution

The fourth proportional to 959, 1,321.36 and 663.76 is: 914.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    959 : 1,321.36 = 663.76 : x
  2. Step 2: Convert to fraction form
    959/1,321.36 = 663.76/x
  3. Step 3: Cross multiply
    959x = 1,321.36 × 663.76
  4. Step 4: Simplify right side
    959x = 877,065.91
  5. Step 5: Solve for x
    x = 877,065.91/959
  6. Step 6: Final answer
    x = 914.56

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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.