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Finding the Fourth Proportional to 178.64, 268.01 and 87.35

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Solution

The fourth proportional to 178.64, 268.01 and 87.35 is: 131.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.64 : 268.01 = 87.35 : x
  2. Step 2: Convert to fraction form
    178.64/268.01 = 87.35/x
  3. Step 3: Cross multiply
    178.64x = 268.01 × 87.35
  4. Step 4: Simplify right side
    178.64x = 23,410.22
  5. Step 5: Solve for x
    x = 23,410.22/178.64
  6. Step 6: Final answer
    x = 131.05

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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.