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Finding the Fourth Proportional to 255.87, 353.05 and 145.30

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Solution

The fourth proportional to 255.87, 353.05 and 145.30 is: 200.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.87 : 353.05 = 145.30 : x
  2. Step 2: Convert to fraction form
    255.87/353.05 = 145.30/x
  3. Step 3: Cross multiply
    255.87x = 353.05 × 145.30
  4. Step 4: Simplify right side
    255.87x = 51,298.17
  5. Step 5: Solve for x
    x = 51,298.17/255.87
  6. Step 6: Final answer
    x = 200.49

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.