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Finding the Fourth Proportional to 893.85, 1,339.62 and 660.88

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Solution

The fourth proportional to 893.85, 1,339.62 and 660.88 is: 990.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    893.85 : 1,339.62 = 660.88 : x
  2. Step 2: Convert to fraction form
    893.85/1,339.62 = 660.88/x
  3. Step 3: Cross multiply
    893.85x = 1,339.62 × 660.88
  4. Step 4: Simplify right side
    893.85x = 885,328.07
  5. Step 5: Solve for x
    x = 885,328.07/893.85
  6. Step 6: Final answer
    x = 990.47

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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.