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Finding the Fourth Proportional to 695.93, 1,041.81 and 421.18

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Solution

The fourth proportional to 695.93, 1,041.81 and 421.18 is: 630.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    695.93 : 1,041.81 = 421.18 : x
  2. Step 2: Convert to fraction form
    695.93/1,041.81 = 421.18/x
  3. Step 3: Cross multiply
    695.93x = 1,041.81 × 421.18
  4. Step 4: Simplify right side
    695.93x = 438,789.54
  5. Step 5: Solve for x
    x = 438,789.54/695.93
  6. Step 6: Final answer
    x = 630.51

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.