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Finding the Fourth Proportional to 1,287.42, 1,931.37 and 422.34

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Solution

The fourth proportional to 1,287.42, 1,931.37 and 422.34 is: 633.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.42 : 1,931.37 = 422.34 : x
  2. Step 2: Convert to fraction form
    1,287.42/1,931.37 = 422.34/x
  3. Step 3: Cross multiply
    1,287.42x = 1,931.37 × 422.34
  4. Step 4: Simplify right side
    1,287.42x = 815,694.81
  5. Step 5: Solve for x
    x = 815,694.81/1,287.42
  6. Step 6: Final answer
    x = 633.59

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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.