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Finding the Fourth Proportional to 424.85, 639.51 and 362.21

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Solution

The fourth proportional to 424.85, 639.51 and 362.21 is: 545.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    424.85 : 639.51 = 362.21 : x
  2. Step 2: Convert to fraction form
    424.85/639.51 = 362.21/x
  3. Step 3: Cross multiply
    424.85x = 639.51 × 362.21
  4. Step 4: Simplify right side
    424.85x = 231,632.36
  5. Step 5: Solve for x
    x = 231,632.36/424.85
  6. Step 6: Final answer
    x = 545.22

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.