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Finding the Fourth Proportional to 1,112.71, 1,669.36 and 926.61

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Solution

The fourth proportional to 1,112.71, 1,669.36 and 926.61 is: 1,390.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,112.71 : 1,669.36 = 926.61 : x
  2. Step 2: Convert to fraction form
    1,112.71/1,669.36 = 926.61/x
  3. Step 3: Cross multiply
    1,112.71x = 1,669.36 × 926.61
  4. Step 4: Simplify right side
    1,112.71x = 1,546,845.67
  5. Step 5: Solve for x
    x = 1,546,845.67/1,112.71
  6. Step 6: Final answer
    x = 1,390.16

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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.