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Finding the Fourth Proportional to 769.48, 1,156.44 and 640.30

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Solution

The fourth proportional to 769.48, 1,156.44 and 640.30 is: 962.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.48 : 1,156.44 = 640.30 : x
  2. Step 2: Convert to fraction form
    769.48/1,156.44 = 640.30/x
  3. Step 3: Cross multiply
    769.48x = 1,156.44 × 640.30
  4. Step 4: Simplify right side
    769.48x = 740,468.53
  5. Step 5: Solve for x
    x = 740,468.53/769.48
  6. Step 6: Final answer
    x = 962.30

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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.