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Finding the Fourth Proportional to 284.47, 426.86 and 140.20

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Solution

The fourth proportional to 284.47, 426.86 and 140.20 is: 210.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.47 : 426.86 = 140.20 : x
  2. Step 2: Convert to fraction form
    284.47/426.86 = 140.20/x
  3. Step 3: Cross multiply
    284.47x = 426.86 × 140.20
  4. Step 4: Simplify right side
    284.47x = 59,842.94
  5. Step 5: Solve for x
    x = 59,842.94/284.47
  6. Step 6: Final answer
    x = 210.37

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.