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Finding the Fourth Proportional to 153.49, 230.11 and 72.31

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Solution

The fourth proportional to 153.49, 230.11 and 72.31 is: 108.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.49 : 230.11 = 72.31 : x
  2. Step 2: Convert to fraction form
    153.49/230.11 = 72.31/x
  3. Step 3: Cross multiply
    153.49x = 230.11 × 72.31
  4. Step 4: Simplify right side
    153.49x = 16,638.50
  5. Step 5: Solve for x
    x = 16,638.50/153.49
  6. Step 6: Final answer
    x = 108.40

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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.