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Finding the Fourth Proportional to 678.96, 1,017.81 and 245.79

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Solution

The fourth proportional to 678.96, 1,017.81 and 245.79 is: 368.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.96 : 1,017.81 = 245.79 : x
  2. Step 2: Convert to fraction form
    678.96/1,017.81 = 245.79/x
  3. Step 3: Cross multiply
    678.96x = 1,017.81 × 245.79
  4. Step 4: Simplify right side
    678.96x = 250,167.52
  5. Step 5: Solve for x
    x = 250,167.52/678.96
  6. Step 6: Final answer
    x = 368.46

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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.