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Finding the Fourth Proportional to 769.06, 1,058.54 and 643.34

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Solution

The fourth proportional to 769.06, 1,058.54 and 643.34 is: 885.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.06 : 1,058.54 = 643.34 : x
  2. Step 2: Convert to fraction form
    769.06/1,058.54 = 643.34/x
  3. Step 3: Cross multiply
    769.06x = 1,058.54 × 643.34
  4. Step 4: Simplify right side
    769.06x = 681,001.12
  5. Step 5: Solve for x
    x = 681,001.12/769.06
  6. Step 6: Final answer
    x = 885.50

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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.