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Finding the Fourth Proportional to 678.37, 1,016.76 and 312.38

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Solution

The fourth proportional to 678.37, 1,016.76 and 312.38 is: 468.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.37 : 1,016.76 = 312.38 : x
  2. Step 2: Convert to fraction form
    678.37/1,016.76 = 312.38/x
  3. Step 3: Cross multiply
    678.37x = 1,016.76 × 312.38
  4. Step 4: Simplify right side
    678.37x = 317,615.49
  5. Step 5: Solve for x
    x = 317,615.49/678.37
  6. Step 6: Final answer
    x = 468.20

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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.