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Finding the Fourth Proportional to 104.28, 157.14 and 99.30

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Solution

The fourth proportional to 104.28, 157.14 and 99.30 is: 149.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.28 : 157.14 = 99.30 : x
  2. Step 2: Convert to fraction form
    104.28/157.14 = 99.30/x
  3. Step 3: Cross multiply
    104.28x = 157.14 × 99.30
  4. Step 4: Simplify right side
    104.28x = 15,604.00
  5. Step 5: Solve for x
    x = 15,604.00/104.28
  6. Step 6: Final answer
    x = 149.64

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.