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Finding the Fourth Proportional to 678.48, 1,017.54 and 191.49

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Solution

The fourth proportional to 678.48, 1,017.54 and 191.49 is: 287.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.48 : 1,017.54 = 191.49 : x
  2. Step 2: Convert to fraction form
    678.48/1,017.54 = 191.49/x
  3. Step 3: Cross multiply
    678.48x = 1,017.54 × 191.49
  4. Step 4: Simplify right side
    678.48x = 194,848.73
  5. Step 5: Solve for x
    x = 194,848.73/678.48
  6. Step 6: Final answer
    x = 287.18

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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.