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Finding the Fourth Proportional to 674.42, 1,012.04 and 442.76

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Solution

The fourth proportional to 674.42, 1,012.04 and 442.76 is: 664.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.42 : 1,012.04 = 442.76 : x
  2. Step 2: Convert to fraction form
    674.42/1,012.04 = 442.76/x
  3. Step 3: Cross multiply
    674.42x = 1,012.04 × 442.76
  4. Step 4: Simplify right side
    674.42x = 448,090.83
  5. Step 5: Solve for x
    x = 448,090.83/674.42
  6. Step 6: Final answer
    x = 664.41

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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.