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Finding the Fourth Proportional to 768.78, 1,145.88 and 743.47

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Solution

The fourth proportional to 768.78, 1,145.88 and 743.47 is: 1,108.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.78 : 1,145.88 = 743.47 : x
  2. Step 2: Convert to fraction form
    768.78/1,145.88 = 743.47/x
  3. Step 3: Cross multiply
    768.78x = 1,145.88 × 743.47
  4. Step 4: Simplify right side
    768.78x = 851,925.67
  5. Step 5: Solve for x
    x = 851,925.67/768.78
  6. Step 6: Final answer
    x = 1,108.15

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.