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Finding the Fourth Proportional to 322.42, 484.18 and 287.78

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Solution

The fourth proportional to 322.42, 484.18 and 287.78 is: 432.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    322.42 : 484.18 = 287.78 : x
  2. Step 2: Convert to fraction form
    322.42/484.18 = 287.78/x
  3. Step 3: Cross multiply
    322.42x = 484.18 × 287.78
  4. Step 4: Simplify right side
    322.42x = 139,337.32
  5. Step 5: Solve for x
    x = 139,337.32/322.42
  6. Step 6: Final answer
    x = 432.16

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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.