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Finding the Fourth Proportional to 99.03, 147.79 and 90.76

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Solution

The fourth proportional to 99.03, 147.79 and 90.76 is: 135.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.03 : 147.79 = 90.76 : x
  2. Step 2: Convert to fraction form
    99.03/147.79 = 90.76/x
  3. Step 3: Cross multiply
    99.03x = 147.79 × 90.76
  4. Step 4: Simplify right side
    99.03x = 13,413.42
  5. Step 5: Solve for x
    x = 13,413.42/99.03
  6. Step 6: Final answer
    x = 135.45

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.