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Finding the Fourth Proportional to 113.30, 169.74 and 90.50

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Solution

The fourth proportional to 113.30, 169.74 and 90.50 is: 135.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.30 : 169.74 = 90.50 : x
  2. Step 2: Convert to fraction form
    113.30/169.74 = 90.50/x
  3. Step 3: Cross multiply
    113.30x = 169.74 × 90.50
  4. Step 4: Simplify right side
    113.30x = 15,361.47
  5. Step 5: Solve for x
    x = 15,361.47/113.30
  6. Step 6: Final answer
    x = 135.58

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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.