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Finding the Fourth Proportional to 202.40, 303.48 and 72.40

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Solution

The fourth proportional to 202.40, 303.48 and 72.40 is: 108.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.40 : 303.48 = 72.40 : x
  2. Step 2: Convert to fraction form
    202.40/303.48 = 72.40/x
  3. Step 3: Cross multiply
    202.40x = 303.48 × 72.40
  4. Step 4: Simplify right side
    202.40x = 21,971.95
  5. Step 5: Solve for x
    x = 21,971.95/202.40
  6. Step 6: Final answer
    x = 108.56

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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.