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Finding the Fourth Proportional to 284.42, 425.76 and 215.30

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Solution

The fourth proportional to 284.42, 425.76 and 215.30 is: 322.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.42 : 425.76 = 215.30 : x
  2. Step 2: Convert to fraction form
    284.42/425.76 = 215.30/x
  3. Step 3: Cross multiply
    284.42x = 425.76 × 215.30
  4. Step 4: Simplify right side
    284.42x = 91,666.13
  5. Step 5: Solve for x
    x = 91,666.13/284.42
  6. Step 6: Final answer
    x = 322.29

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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.