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Finding the Fourth Proportional to 145.73, 201.20 and 90.56

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Solution

The fourth proportional to 145.73, 201.20 and 90.56 is: 125.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.73 : 201.20 = 90.56 : x
  2. Step 2: Convert to fraction form
    145.73/201.20 = 90.56/x
  3. Step 3: Cross multiply
    145.73x = 201.20 × 90.56
  4. Step 4: Simplify right side
    145.73x = 18,219.21
  5. Step 5: Solve for x
    x = 18,219.21/145.73
  6. Step 6: Final answer
    x = 125.02

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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.