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Finding the Fourth Proportional to 1,112.55, 1,669.41 and 678.75

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Solution

The fourth proportional to 1,112.55, 1,669.41 and 678.75 is: 1,018.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,112.55 : 1,669.41 = 678.75 : x
  2. Step 2: Convert to fraction form
    1,112.55/1,669.41 = 678.75/x
  3. Step 3: Cross multiply
    1,112.55x = 1,669.41 × 678.75
  4. Step 4: Simplify right side
    1,112.55x = 1,133,112.04
  5. Step 5: Solve for x
    x = 1,133,112.04/1,112.55
  6. Step 6: Final answer
    x = 1,018.48

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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.