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Finding the Fourth Proportional to 145.82, 201.12 and 99.18

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Solution

The fourth proportional to 145.82, 201.12 and 99.18 is: 136.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.82 : 201.12 = 99.18 : x
  2. Step 2: Convert to fraction form
    145.82/201.12 = 99.18/x
  3. Step 3: Cross multiply
    145.82x = 201.12 × 99.18
  4. Step 4: Simplify right side
    145.82x = 19,947.08
  5. Step 5: Solve for x
    x = 19,947.08/145.82
  6. Step 6: Final answer
    x = 136.80

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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.