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Finding the Fourth Proportional to 282.90, 423.99 and 145.74

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Solution

The fourth proportional to 282.90, 423.99 and 145.74 is: 218.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.90 : 423.99 = 145.74 : x
  2. Step 2: Convert to fraction form
    282.90/423.99 = 145.74/x
  3. Step 3: Cross multiply
    282.90x = 423.99 × 145.74
  4. Step 4: Simplify right side
    282.90x = 61,792.30
  5. Step 5: Solve for x
    x = 61,792.30/282.90
  6. Step 6: Final answer
    x = 218.42

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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.