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Finding the Fourth Proportional to 99.21, 148.77 and 89.58

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Solution

The fourth proportional to 99.21, 148.77 and 89.58 is: 134.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.21 : 148.77 = 89.58 : x
  2. Step 2: Convert to fraction form
    99.21/148.77 = 89.58/x
  3. Step 3: Cross multiply
    99.21x = 148.77 × 89.58
  4. Step 4: Simplify right side
    99.21x = 13,326.82
  5. Step 5: Solve for x
    x = 13,326.82/99.21
  6. Step 6: Final answer
    x = 134.33

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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.