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Finding the Fourth Proportional to 674.72, 931.30 and 395.18

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Solution

The fourth proportional to 674.72, 931.30 and 395.18 is: 545.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.72 : 931.30 = 395.18 : x
  2. Step 2: Convert to fraction form
    674.72/931.30 = 395.18/x
  3. Step 3: Cross multiply
    674.72x = 931.30 × 395.18
  4. Step 4: Simplify right side
    674.72x = 368,031.13
  5. Step 5: Solve for x
    x = 368,031.13/674.72
  6. Step 6: Final answer
    x = 545.46

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.