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Finding the Fourth Proportional to 145.96, 201.44 and 90.72

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Solution

The fourth proportional to 145.96, 201.44 and 90.72 is: 125.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.96 : 201.44 = 90.72 : x
  2. Step 2: Convert to fraction form
    145.96/201.44 = 90.72/x
  3. Step 3: Cross multiply
    145.96x = 201.44 × 90.72
  4. Step 4: Simplify right side
    145.96x = 18,274.86
  5. Step 5: Solve for x
    x = 18,274.86/145.96
  6. Step 6: Final answer
    x = 125.21

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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.