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Finding the Fourth Proportional to 173.76, 260.50 and 91.40

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Solution

The fourth proportional to 173.76, 260.50 and 91.40 is: 137.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    173.76 : 260.50 = 91.40 : x
  2. Step 2: Convert to fraction form
    173.76/260.50 = 91.40/x
  3. Step 3: Cross multiply
    173.76x = 260.50 × 91.40
  4. Step 4: Simplify right side
    173.76x = 23,809.70
  5. Step 5: Solve for x
    x = 23,809.70/173.76
  6. Step 6: Final answer
    x = 137.03

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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.