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Finding the Fourth Proportional to 678.72, 1,017.96 and 191.66

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Solution

The fourth proportional to 678.72, 1,017.96 and 191.66 is: 287.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.72 : 1,017.96 = 191.66 : x
  2. Step 2: Convert to fraction form
    678.72/1,017.96 = 191.66/x
  3. Step 3: Cross multiply
    678.72x = 1,017.96 × 191.66
  4. Step 4: Simplify right side
    678.72x = 195,102.21
  5. Step 5: Solve for x
    x = 195,102.21/678.72
  6. Step 6: Final answer
    x = 287.46

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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.