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Finding the Fourth Proportional to 949.20, 1,309.43 and 817.98

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Solution

The fourth proportional to 949.20, 1,309.43 and 817.98 is: 1,128.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.20 : 1,309.43 = 817.98 : x
  2. Step 2: Convert to fraction form
    949.20/1,309.43 = 817.98/x
  3. Step 3: Cross multiply
    949.20x = 1,309.43 × 817.98
  4. Step 4: Simplify right side
    949.20x = 1,071,083.46
  5. Step 5: Solve for x
    x = 1,071,083.46/949.20
  6. Step 6: Final answer
    x = 1,128.41

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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.