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Finding the Fourth Proportional to 127.05, 175.08 and 99.42

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Solution

The fourth proportional to 127.05, 175.08 and 99.42 is: 137.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.05 : 175.08 = 99.42 : x
  2. Step 2: Convert to fraction form
    127.05/175.08 = 99.42/x
  3. Step 3: Cross multiply
    127.05x = 175.08 × 99.42
  4. Step 4: Simplify right side
    127.05x = 17,406.45
  5. Step 5: Solve for x
    x = 17,406.45/127.05
  6. Step 6: Final answer
    x = 137.00

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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.