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Finding the Fourth Proportional to 98.66, 147.77 and 90.05

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Solution

The fourth proportional to 98.66, 147.77 and 90.05 is: 134.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.66 : 147.77 = 90.05 : x
  2. Step 2: Convert to fraction form
    98.66/147.77 = 90.05/x
  3. Step 3: Cross multiply
    98.66x = 147.77 × 90.05
  4. Step 4: Simplify right side
    98.66x = 13,305.50
  5. Step 5: Solve for x
    x = 13,305.50/98.66
  6. Step 6: Final answer
    x = 134.87

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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.