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Finding the Fourth Proportional to 768.56, 1,058.08 and 665.04

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Solution

The fourth proportional to 768.56, 1,058.08 and 665.04 is: 915.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.56 : 1,058.08 = 665.04 : x
  2. Step 2: Convert to fraction form
    768.56/1,058.08 = 665.04/x
  3. Step 3: Cross multiply
    768.56x = 1,058.08 × 665.04
  4. Step 4: Simplify right side
    768.56x = 703,665.52
  5. Step 5: Solve for x
    x = 703,665.52/768.56
  6. Step 6: Final answer
    x = 915.56

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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.