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Finding the Fourth Proportional to 674.48, 1,010.10 and 399.74

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Solution

The fourth proportional to 674.48, 1,010.10 and 399.74 is: 598.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.48 : 1,010.10 = 399.74 : x
  2. Step 2: Convert to fraction form
    674.48/1,010.10 = 399.74/x
  3. Step 3: Cross multiply
    674.48x = 1,010.10 × 399.74
  4. Step 4: Simplify right side
    674.48x = 403,772.32
  5. Step 5: Solve for x
    x = 403,772.32/674.48
  6. Step 6: Final answer
    x = 598.65

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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.