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Finding the Fourth Proportional to 768.78, 1,060.38 and 474.21

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Solution

The fourth proportional to 768.78, 1,060.38 and 474.21 is: 654.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.78 : 1,060.38 = 474.21 : x
  2. Step 2: Convert to fraction form
    768.78/1,060.38 = 474.21/x
  3. Step 3: Cross multiply
    768.78x = 1,060.38 × 474.21
  4. Step 4: Simplify right side
    768.78x = 502,842.80
  5. Step 5: Solve for x
    x = 502,842.80/768.78
  6. Step 6: Final answer
    x = 654.08

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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.