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Finding the Fourth Proportional to 677.86, 1,016.07 and 641.86

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Solution

The fourth proportional to 677.86, 1,016.07 and 641.86 is: 962.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    677.86 : 1,016.07 = 641.86 : x
  2. Step 2: Convert to fraction form
    677.86/1,016.07 = 641.86/x
  3. Step 3: Cross multiply
    677.86x = 1,016.07 × 641.86
  4. Step 4: Simplify right side
    677.86x = 652,174.69
  5. Step 5: Solve for x
    x = 652,174.69/677.86
  6. Step 6: Final answer
    x = 962.11

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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.