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Finding the Fourth Proportional to 993.10, 1,371.13 and 678.25

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Solution

The fourth proportional to 993.10, 1,371.13 and 678.25 is: 936.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.10 : 1,371.13 = 678.25 : x
  2. Step 2: Convert to fraction form
    993.10/1,371.13 = 678.25/x
  3. Step 3: Cross multiply
    993.10x = 1,371.13 × 678.25
  4. Step 4: Simplify right side
    993.10x = 929,963.80
  5. Step 5: Solve for x
    x = 929,963.80/993.10
  6. Step 6: Final answer
    x = 936.43

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Why These Related Problems?

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