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Finding the Fourth Proportional to 90.53, 125.08 and 74.98

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Solution

The fourth proportional to 90.53, 125.08 and 74.98 is: 103.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.53 : 125.08 = 74.98 : x
  2. Step 2: Convert to fraction form
    90.53/125.08 = 74.98/x
  3. Step 3: Cross multiply
    90.53x = 125.08 × 74.98
  4. Step 4: Simplify right side
    90.53x = 9,378.50
  5. Step 5: Solve for x
    x = 9,378.50/90.53
  6. Step 6: Final answer
    x = 103.60

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.