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Finding the Fourth Proportional to 768.72, 1,060.40 and 458

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Solution

The fourth proportional to 768.72, 1,060.40 and 458 is: 631.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.72 : 1,060.40 = 458 : x
  2. Step 2: Convert to fraction form
    768.72/1,060.40 = 458/x
  3. Step 3: Cross multiply
    768.72x = 1,060.40 × 458
  4. Step 4: Simplify right side
    768.72x = 485,663.20
  5. Step 5: Solve for x
    x = 485,663.20/768.72
  6. Step 6: Final answer
    x = 631.78

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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.