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Finding the Fourth Proportional to 1,279.47, 1,922.40 and 817.46

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Solution

The fourth proportional to 1,279.47, 1,922.40 and 817.46 is: 1,228.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.47 : 1,922.40 = 817.46 : x
  2. Step 2: Convert to fraction form
    1,279.47/1,922.40 = 817.46/x
  3. Step 3: Cross multiply
    1,279.47x = 1,922.40 × 817.46
  4. Step 4: Simplify right side
    1,279.47x = 1,571,475.49
  5. Step 5: Solve for x
    x = 1,571,475.49/1,279.47
  6. Step 6: Final answer
    x = 1,228.22

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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.