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Finding the Fourth Proportional to 768.53, 1,058.35 and 721.61

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Solution

The fourth proportional to 768.53, 1,058.35 and 721.61 is: 993.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.53 : 1,058.35 = 721.61 : x
  2. Step 2: Convert to fraction form
    768.53/1,058.35 = 721.61/x
  3. Step 3: Cross multiply
    768.53x = 1,058.35 × 721.61
  4. Step 4: Simplify right side
    768.53x = 763,715.94
  5. Step 5: Solve for x
    x = 763,715.94/768.53
  6. Step 6: Final answer
    x = 993.74

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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.