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Finding the Fourth Proportional to 1,112.84, 1,535.52 and 647

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Solution

The fourth proportional to 1,112.84, 1,535.52 and 647 is: 892.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,112.84 : 1,535.52 = 647 : x
  2. Step 2: Convert to fraction form
    1,112.84/1,535.52 = 647/x
  3. Step 3: Cross multiply
    1,112.84x = 1,535.52 × 647
  4. Step 4: Simplify right side
    1,112.84x = 993,481.44
  5. Step 5: Solve for x
    x = 993,481.44/1,112.84
  6. Step 6: Final answer
    x = 892.74

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.