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Finding the Fourth Proportional to 149.35, 224.07 and 72.40

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Solution

The fourth proportional to 149.35, 224.07 and 72.40 is: 108.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.35 : 224.07 = 72.40 : x
  2. Step 2: Convert to fraction form
    149.35/224.07 = 72.40/x
  3. Step 3: Cross multiply
    149.35x = 224.07 × 72.40
  4. Step 4: Simplify right side
    149.35x = 16,222.67
  5. Step 5: Solve for x
    x = 16,222.67/149.35
  6. Step 6: Final answer
    x = 108.62

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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.