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Finding the Fourth Proportional to 158.26, 218.40 and 99.28

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Solution

The fourth proportional to 158.26, 218.40 and 99.28 is: 137.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.26 : 218.40 = 99.28 : x
  2. Step 2: Convert to fraction form
    158.26/218.40 = 99.28/x
  3. Step 3: Cross multiply
    158.26x = 218.40 × 99.28
  4. Step 4: Simplify right side
    158.26x = 21,682.75
  5. Step 5: Solve for x
    x = 21,682.75/158.26
  6. Step 6: Final answer
    x = 137.01

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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.