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Finding the Fourth Proportional to 768.25, 1,058.79 and 558.10

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Solution

The fourth proportional to 768.25, 1,058.79 and 558.10 is: 769.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.25 : 1,058.79 = 558.10 : x
  2. Step 2: Convert to fraction form
    768.25/1,058.79 = 558.10/x
  3. Step 3: Cross multiply
    768.25x = 1,058.79 × 558.10
  4. Step 4: Simplify right side
    768.25x = 590,910.70
  5. Step 5: Solve for x
    x = 590,910.70/768.25
  6. Step 6: Final answer
    x = 769.16

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Double scale
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1.5x scale

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.