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Finding the Fourth Proportional to 153.76, 230.74 and 72.64

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Solution

The fourth proportional to 153.76, 230.74 and 72.64 is: 109.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.76 : 230.74 = 72.64 : x
  2. Step 2: Convert to fraction form
    153.76/230.74 = 72.64/x
  3. Step 3: Cross multiply
    153.76x = 230.74 × 72.64
  4. Step 4: Simplify right side
    153.76x = 16,760.95
  5. Step 5: Solve for x
    x = 16,760.95/153.76
  6. Step 6: Final answer
    x = 109.01

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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.