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Finding the Fourth Proportional to 1,094.58, 1,639.35 and 660.78

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Solution

The fourth proportional to 1,094.58, 1,639.35 and 660.78 is: 989.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,094.58 : 1,639.35 = 660.78 : x
  2. Step 2: Convert to fraction form
    1,094.58/1,639.35 = 660.78/x
  3. Step 3: Cross multiply
    1,094.58x = 1,639.35 × 660.78
  4. Step 4: Simplify right side
    1,094.58x = 1,083,249.69
  5. Step 5: Solve for x
    x = 1,083,249.69/1,094.58
  6. Step 6: Final answer
    x = 989.65

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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.