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Finding the Fourth Proportional to 728.77, 1,005.54 and 418.27

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Solution

The fourth proportional to 728.77, 1,005.54 and 418.27 is: 577.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.77 : 1,005.54 = 418.27 : x
  2. Step 2: Convert to fraction form
    728.77/1,005.54 = 418.27/x
  3. Step 3: Cross multiply
    728.77x = 1,005.54 × 418.27
  4. Step 4: Simplify right side
    728.77x = 420,587.22
  5. Step 5: Solve for x
    x = 420,587.22/728.77
  6. Step 6: Final answer
    x = 577.12

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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.