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Finding the Fourth Proportional to 98.73, 148 and 90.63

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Solution

The fourth proportional to 98.73, 148 and 90.63 is: 135.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.73 : 148 = 90.63 : x
  2. Step 2: Convert to fraction form
    98.73/148 = 90.63/x
  3. Step 3: Cross multiply
    98.73x = 148 × 90.63
  4. Step 4: Simplify right side
    98.73x = 13,413.24
  5. Step 5: Solve for x
    x = 13,413.24/98.73
  6. Step 6: Final answer
    x = 135.86

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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.