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Finding the Fourth Proportional to 412.18, 569.39 and 320.11

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Solution

The fourth proportional to 412.18, 569.39 and 320.11 is: 442.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.18 : 569.39 = 320.11 : x
  2. Step 2: Convert to fraction form
    412.18/569.39 = 320.11/x
  3. Step 3: Cross multiply
    412.18x = 569.39 × 320.11
  4. Step 4: Simplify right side
    412.18x = 182,262.99
  5. Step 5: Solve for x
    x = 182,262.99/412.18
  6. Step 6: Final answer
    x = 442.20

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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.