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Finding the Fourth Proportional to 958.95, 1,320.57 and 663.72

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Solution

The fourth proportional to 958.95, 1,320.57 and 663.72 is: 914.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    958.95 : 1,320.57 = 663.72 : x
  2. Step 2: Convert to fraction form
    958.95/1,320.57 = 663.72/x
  3. Step 3: Cross multiply
    958.95x = 1,320.57 × 663.72
  4. Step 4: Simplify right side
    958.95x = 876,488.72
  5. Step 5: Solve for x
    x = 876,488.72/958.95
  6. Step 6: Final answer
    x = 914.01

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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.