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Finding the Fourth Proportional to 284.55, 425.88 and 215.91

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Solution

The fourth proportional to 284.55, 425.88 and 215.91 is: 323.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.55 : 425.88 = 215.91 : x
  2. Step 2: Convert to fraction form
    284.55/425.88 = 215.91/x
  3. Step 3: Cross multiply
    284.55x = 425.88 × 215.91
  4. Step 4: Simplify right side
    284.55x = 91,951.75
  5. Step 5: Solve for x
    x = 91,951.75/284.55
  6. Step 6: Final answer
    x = 323.15

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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.