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Finding the Fourth Proportional to 773.16, 1,158.39 and 643.99

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Solution

The fourth proportional to 773.16, 1,158.39 and 643.99 is: 964.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    773.16 : 1,158.39 = 643.99 : x
  2. Step 2: Convert to fraction form
    773.16/1,158.39 = 643.99/x
  3. Step 3: Cross multiply
    773.16x = 1,158.39 × 643.99
  4. Step 4: Simplify right side
    773.16x = 745,991.58
  5. Step 5: Solve for x
    x = 745,991.58/773.16
  6. Step 6: Final answer
    x = 964.86

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.