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Finding the Fourth Proportional to 735.91, 1,015.56 and 421.18

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Solution

The fourth proportional to 735.91, 1,015.56 and 421.18 is: 581.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    735.91 : 1,015.56 = 421.18 : x
  2. Step 2: Convert to fraction form
    735.91/1,015.56 = 421.18/x
  3. Step 3: Cross multiply
    735.91x = 1,015.56 × 421.18
  4. Step 4: Simplify right side
    735.91x = 427,729.97
  5. Step 5: Solve for x
    x = 427,729.97/735.91
  6. Step 6: Final answer
    x = 581.22

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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.