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Finding the Fourth Proportional to 1,287.14, 1,931.07 and 422.06

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Solution

The fourth proportional to 1,287.14, 1,931.07 and 422.06 is: 633.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.14 : 1,931.07 = 422.06 : x
  2. Step 2: Convert to fraction form
    1,287.14/1,931.07 = 422.06/x
  3. Step 3: Cross multiply
    1,287.14x = 1,931.07 × 422.06
  4. Step 4: Simplify right side
    1,287.14x = 815,027.40
  5. Step 5: Solve for x
    x = 815,027.40/1,287.14
  6. Step 6: Final answer
    x = 633.21

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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.