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Finding the Fourth Proportional to 768.11, 1,058.72 and 543.75

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Solution

The fourth proportional to 768.11, 1,058.72 and 543.75 is: 749.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.11 : 1,058.72 = 543.75 : x
  2. Step 2: Convert to fraction form
    768.11/1,058.72 = 543.75/x
  3. Step 3: Cross multiply
    768.11x = 1,058.72 × 543.75
  4. Step 4: Simplify right side
    768.11x = 575,676.28
  5. Step 5: Solve for x
    x = 575,676.28/768.11
  6. Step 6: Final answer
    x = 749.48

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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.