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Finding the Fourth Proportional to 105.54, 157.04 and 99.78

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Solution

The fourth proportional to 105.54, 157.04 and 99.78 is: 148.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.54 : 157.04 = 99.78 : x
  2. Step 2: Convert to fraction form
    105.54/157.04 = 99.78/x
  3. Step 3: Cross multiply
    105.54x = 157.04 × 99.78
  4. Step 4: Simplify right side
    105.54x = 15,668.95
  5. Step 5: Solve for x
    x = 15,668.95/105.54
  6. Step 6: Final answer
    x = 148.46

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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.