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Finding the Fourth Proportional to 284.64, 426.90 and 99.55

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Solution

The fourth proportional to 284.64, 426.90 and 99.55 is: 149.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.64 : 426.90 = 99.55 : x
  2. Step 2: Convert to fraction form
    284.64/426.90 = 99.55/x
  3. Step 3: Cross multiply
    284.64x = 426.90 × 99.55
  4. Step 4: Simplify right side
    284.64x = 42,497.90
  5. Step 5: Solve for x
    x = 42,497.90/284.64
  6. Step 6: Final answer
    x = 149.30

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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.