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Finding the Fourth Proportional to 695.54, 1,042.23 and 438.50

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Solution

The fourth proportional to 695.54, 1,042.23 and 438.50 is: 657.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    695.54 : 1,042.23 = 438.50 : x
  2. Step 2: Convert to fraction form
    695.54/1,042.23 = 438.50/x
  3. Step 3: Cross multiply
    695.54x = 1,042.23 × 438.50
  4. Step 4: Simplify right side
    695.54x = 457,017.86
  5. Step 5: Solve for x
    x = 457,017.86/695.54
  6. Step 6: Final answer
    x = 657.07

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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.