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Finding the Fourth Proportional to 282.21, 423.15 and 99.55

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Solution

The fourth proportional to 282.21, 423.15 and 99.55 is: 149.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.21 : 423.15 = 99.55 : x
  2. Step 2: Convert to fraction form
    282.21/423.15 = 99.55/x
  3. Step 3: Cross multiply
    282.21x = 423.15 × 99.55
  4. Step 4: Simplify right side
    282.21x = 42,124.58
  5. Step 5: Solve for x
    x = 42,124.58/282.21
  6. Step 6: Final answer
    x = 149.27

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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.