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Finding the Fourth Proportional to 99.33, 148.33 and 85.47

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Solution

The fourth proportional to 99.33, 148.33 and 85.47 is: 127.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.33 : 148.33 = 85.47 : x
  2. Step 2: Convert to fraction form
    99.33/148.33 = 85.47/x
  3. Step 3: Cross multiply
    99.33x = 148.33 × 85.47
  4. Step 4: Simplify right side
    99.33x = 12,678.15
  5. Step 5: Solve for x
    x = 12,678.15/99.33
  6. Step 6: Final answer
    x = 127.64

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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.