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Finding the Fourth Proportional to 700.20, 965.86 and 405.42

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Solution

The fourth proportional to 700.20, 965.86 and 405.42 is: 559.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    700.20 : 965.86 = 405.42 : x
  2. Step 2: Convert to fraction form
    700.20/965.86 = 405.42/x
  3. Step 3: Cross multiply
    700.20x = 965.86 × 405.42
  4. Step 4: Simplify right side
    700.20x = 391,578.96
  5. Step 5: Solve for x
    x = 391,578.96/700.20
  6. Step 6: Final answer
    x = 559.24

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.