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Finding the Fourth Proportional to 107.28, 148.14 and 99.99

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Solution

The fourth proportional to 107.28, 148.14 and 99.99 is: 138.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.28 : 148.14 = 99.99 : x
  2. Step 2: Convert to fraction form
    107.28/148.14 = 99.99/x
  3. Step 3: Cross multiply
    107.28x = 148.14 × 99.99
  4. Step 4: Simplify right side
    107.28x = 14,812.52
  5. Step 5: Solve for x
    x = 14,812.52/107.28
  6. Step 6: Final answer
    x = 138.07

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.