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Finding the Fourth Proportional to 901.59, 1,243.29 and 665.13

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Solution

The fourth proportional to 901.59, 1,243.29 and 665.13 is: 917.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.59 : 1,243.29 = 665.13 : x
  2. Step 2: Convert to fraction form
    901.59/1,243.29 = 665.13/x
  3. Step 3: Cross multiply
    901.59x = 1,243.29 × 665.13
  4. Step 4: Simplify right side
    901.59x = 826,949.48
  5. Step 5: Solve for x
    x = 826,949.48/901.59
  6. Step 6: Final answer
    x = 917.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.