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Finding the Fourth Proportional to 772.16, 1,156.89 and 642.99

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Solution

The fourth proportional to 772.16, 1,156.89 and 642.99 is: 963.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.16 : 1,156.89 = 642.99 : x
  2. Step 2: Convert to fraction form
    772.16/1,156.89 = 642.99/x
  3. Step 3: Cross multiply
    772.16x = 1,156.89 × 642.99
  4. Step 4: Simplify right side
    772.16x = 743,868.70
  5. Step 5: Solve for x
    x = 743,868.70/772.16
  6. Step 6: Final answer
    x = 963.36

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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.