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Finding the Fourth Proportional to 284.51, 428.86 and 261.11

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Solution

The fourth proportional to 284.51, 428.86 and 261.11 is: 393.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.51 : 428.86 = 261.11 : x
  2. Step 2: Convert to fraction form
    284.51/428.86 = 261.11/x
  3. Step 3: Cross multiply
    284.51x = 428.86 × 261.11
  4. Step 4: Simplify right side
    284.51x = 111,977.49
  5. Step 5: Solve for x
    x = 111,977.49/284.51
  6. Step 6: Final answer
    x = 393.58

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.