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Finding the Fourth Proportional to 411.38, 567.71 and 278.64

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Solution

The fourth proportional to 411.38, 567.71 and 278.64 is: 384.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.38 : 567.71 = 278.64 : x
  2. Step 2: Convert to fraction form
    411.38/567.71 = 278.64/x
  3. Step 3: Cross multiply
    411.38x = 567.71 × 278.64
  4. Step 4: Simplify right side
    411.38x = 158,186.37
  5. Step 5: Solve for x
    x = 158,186.37/411.38
  6. Step 6: Final answer
    x = 384.53

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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.