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Finding the Fourth Proportional to 677.80, 1,016.70 and 404.20

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Solution

The fourth proportional to 677.80, 1,016.70 and 404.20 is: 606.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    677.80 : 1,016.70 = 404.20 : x
  2. Step 2: Convert to fraction form
    677.80/1,016.70 = 404.20/x
  3. Step 3: Cross multiply
    677.80x = 1,016.70 × 404.20
  4. Step 4: Simplify right side
    677.80x = 410,950.14
  5. Step 5: Solve for x
    x = 410,950.14/677.80
  6. Step 6: Final answer
    x = 606.30

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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.