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Finding the Fourth Proportional to 971.31, 1,449.63 and 905.47

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Solution

The fourth proportional to 971.31, 1,449.63 and 905.47 is: 1,351.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.31 : 1,449.63 = 905.47 : x
  2. Step 2: Convert to fraction form
    971.31/1,449.63 = 905.47/x
  3. Step 3: Cross multiply
    971.31x = 1,449.63 × 905.47
  4. Step 4: Simplify right side
    971.31x = 1,312,591.95
  5. Step 5: Solve for x
    x = 1,312,591.95/971.31
  6. Step 6: Final answer
    x = 1,351.37

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.