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Finding the Fourth Proportional to 1,222.60, 1,686.54 and 927.38

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Solution

The fourth proportional to 1,222.60, 1,686.54 and 927.38 is: 1,279.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,222.60 : 1,686.54 = 927.38 : x
  2. Step 2: Convert to fraction form
    1,222.60/1,686.54 = 927.38/x
  3. Step 3: Cross multiply
    1,222.60x = 1,686.54 × 927.38
  4. Step 4: Simplify right side
    1,222.60x = 1,564,063.47
  5. Step 5: Solve for x
    x = 1,564,063.47/1,222.60
  6. Step 6: Final answer
    x = 1,279.29

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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.