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Finding the Fourth Proportional to 678.89, 1,018.17 and 191.93

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Solution

The fourth proportional to 678.89, 1,018.17 and 191.93 is: 287.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.89 : 1,018.17 = 191.93 : x
  2. Step 2: Convert to fraction form
    678.89/1,018.17 = 191.93/x
  3. Step 3: Cross multiply
    678.89x = 1,018.17 × 191.93
  4. Step 4: Simplify right side
    678.89x = 195,412.28
  5. Step 5: Solve for x
    x = 195,412.28/678.89
  6. Step 6: Final answer
    x = 287.84

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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.