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Finding the Fourth Proportional to 695.02, 1,042.80 and 421.31

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Solution

The fourth proportional to 695.02, 1,042.80 and 421.31 is: 632.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    695.02 : 1,042.80 = 421.31 : x
  2. Step 2: Convert to fraction form
    695.02/1,042.80 = 421.31/x
  3. Step 3: Cross multiply
    695.02x = 1,042.80 × 421.31
  4. Step 4: Simplify right side
    695.02x = 439,343.65
  5. Step 5: Solve for x
    x = 439,343.65/695.02
  6. Step 6: Final answer
    x = 632.13

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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.