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Finding the Fourth Proportional to 1,072.81, 1,478.28 and 792.61

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Solution

The fourth proportional to 1,072.81, 1,478.28 and 792.61 is: 1,092.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,072.81 : 1,478.28 = 792.61 : x
  2. Step 2: Convert to fraction form
    1,072.81/1,478.28 = 792.61/x
  3. Step 3: Cross multiply
    1,072.81x = 1,478.28 × 792.61
  4. Step 4: Simplify right side
    1,072.81x = 1,171,699.51
  5. Step 5: Solve for x
    x = 1,171,699.51/1,072.81
  6. Step 6: Final answer
    x = 1,092.18

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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.