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Finding the Fourth Proportional to 1,287.84, 1,932 and 422.16

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Solution

The fourth proportional to 1,287.84, 1,932 and 422.16 is: 633.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.84 : 1,932 = 422.16 : x
  2. Step 2: Convert to fraction form
    1,287.84/1,932 = 422.16/x
  3. Step 3: Cross multiply
    1,287.84x = 1,932 × 422.16
  4. Step 4: Simplify right side
    1,287.84x = 815,613.12
  5. Step 5: Solve for x
    x = 815,613.12/1,287.84
  6. Step 6: Final answer
    x = 633.32

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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.