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Finding the Fourth Proportional to 901.20, 1,351.89 and 316.25

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Solution

The fourth proportional to 901.20, 1,351.89 and 316.25 is: 474.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.20 : 1,351.89 = 316.25 : x
  2. Step 2: Convert to fraction form
    901.20/1,351.89 = 316.25/x
  3. Step 3: Cross multiply
    901.20x = 1,351.89 × 316.25
  4. Step 4: Simplify right side
    901.20x = 427,528.45
  5. Step 5: Solve for x
    x = 427,528.45/901.20
  6. Step 6: Final answer
    x = 474.40

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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.