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Finding the Fourth Proportional to 1,971.28, 2,956.02 and 672.40

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Solution

The fourth proportional to 1,971.28, 2,956.02 and 672.40 is: 1,008.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,971.28 : 2,956.02 = 672.40 : x
  2. Step 2: Convert to fraction form
    1,971.28/2,956.02 = 672.40/x
  3. Step 3: Cross multiply
    1,971.28x = 2,956.02 × 672.40
  4. Step 4: Simplify right side
    1,971.28x = 1,987,627.85
  5. Step 5: Solve for x
    x = 1,987,627.85/1,971.28
  6. Step 6: Final answer
    x = 1,008.29

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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.