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Finding the Fourth Proportional to 728.82, 1,005.91 and 434.26

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Solution

The fourth proportional to 728.82, 1,005.91 and 434.26 is: 599.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.82 : 1,005.91 = 434.26 : x
  2. Step 2: Convert to fraction form
    728.82/1,005.91 = 434.26/x
  3. Step 3: Cross multiply
    728.82x = 1,005.91 × 434.26
  4. Step 4: Simplify right side
    728.82x = 436,826.48
  5. Step 5: Solve for x
    x = 436,826.48/728.82
  6. Step 6: Final answer
    x = 599.36

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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.