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Finding the Fourth Proportional to 421.82, 582.15 and 247.19

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Solution

The fourth proportional to 421.82, 582.15 and 247.19 is: 341.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.82 : 582.15 = 247.19 : x
  2. Step 2: Convert to fraction form
    421.82/582.15 = 247.19/x
  3. Step 3: Cross multiply
    421.82x = 582.15 × 247.19
  4. Step 4: Simplify right side
    421.82x = 143,901.66
  5. Step 5: Solve for x
    x = 143,901.66/421.82
  6. Step 6: Final answer
    x = 341.14

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Double scale
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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.