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Finding the Fourth Proportional to 178.32, 246.08 and 99.64

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Solution

The fourth proportional to 178.32, 246.08 and 99.64 is: 137.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.32 : 246.08 = 99.64 : x
  2. Step 2: Convert to fraction form
    178.32/246.08 = 99.64/x
  3. Step 3: Cross multiply
    178.32x = 246.08 × 99.64
  4. Step 4: Simplify right side
    178.32x = 24,518.43
  5. Step 5: Solve for x
    x = 24,518.43/178.32
  6. Step 6: Final answer
    x = 137.50

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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.