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Finding the Fourth Proportional to 202.74, 304.02 and 87.12

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Solution

The fourth proportional to 202.74, 304.02 and 87.12 is: 130.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.74 : 304.02 = 87.12 : x
  2. Step 2: Convert to fraction form
    202.74/304.02 = 87.12/x
  3. Step 3: Cross multiply
    202.74x = 304.02 × 87.12
  4. Step 4: Simplify right side
    202.74x = 26,486.22
  5. Step 5: Solve for x
    x = 26,486.22/202.74
  6. Step 6: Final answer
    x = 130.64

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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.