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Finding the Fourth Proportional to 901.22, 1,351.26 and 315.90

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Solution

The fourth proportional to 901.22, 1,351.26 and 315.90 is: 473.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.22 : 1,351.26 = 315.90 : x
  2. Step 2: Convert to fraction form
    901.22/1,351.26 = 315.90/x
  3. Step 3: Cross multiply
    901.22x = 1,351.26 × 315.90
  4. Step 4: Simplify right side
    901.22x = 426,863.03
  5. Step 5: Solve for x
    x = 426,863.03/901.22
  6. Step 6: Final answer
    x = 473.65

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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.