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Finding the Fourth Proportional to 412.20, 569.42 and 288.20

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Solution

The fourth proportional to 412.20, 569.42 and 288.20 is: 398.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.20 : 569.42 = 288.20 : x
  2. Step 2: Convert to fraction form
    412.20/569.42 = 288.20/x
  3. Step 3: Cross multiply
    412.20x = 569.42 × 288.20
  4. Step 4: Simplify right side
    412.20x = 164,106.84
  5. Step 5: Solve for x
    x = 164,106.84/412.20
  6. Step 6: Final answer
    x = 398.12

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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.