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Finding the Fourth Proportional to 253.68, 380.55 and 99.60

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Solution

The fourth proportional to 253.68, 380.55 and 99.60 is: 149.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.68 : 380.55 = 99.60 : x
  2. Step 2: Convert to fraction form
    253.68/380.55 = 99.60/x
  3. Step 3: Cross multiply
    253.68x = 380.55 × 99.60
  4. Step 4: Simplify right side
    253.68x = 37,902.78
  5. Step 5: Solve for x
    x = 37,902.78/253.68
  6. Step 6: Final answer
    x = 149.41

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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.