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Finding the Fourth Proportional to 678.48, 1,016.72 and 609.64

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Solution

The fourth proportional to 678.48, 1,016.72 and 609.64 is: 913.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.48 : 1,016.72 = 609.64 : x
  2. Step 2: Convert to fraction form
    678.48/1,016.72 = 609.64/x
  3. Step 3: Cross multiply
    678.48x = 1,016.72 × 609.64
  4. Step 4: Simplify right side
    678.48x = 619,833.18
  5. Step 5: Solve for x
    x = 619,833.18/678.48
  6. Step 6: Final answer
    x = 913.56

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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.