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Finding the Fourth Proportional to 657.69, 986.22 and 383.88

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Solution

The fourth proportional to 657.69, 986.22 and 383.88 is: 575.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.69 : 986.22 = 383.88 : x
  2. Step 2: Convert to fraction form
    657.69/986.22 = 383.88/x
  3. Step 3: Cross multiply
    657.69x = 986.22 × 383.88
  4. Step 4: Simplify right side
    657.69x = 378,590.13
  5. Step 5: Solve for x
    x = 378,590.13/657.69
  6. Step 6: Final answer
    x = 575.64

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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.