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Finding the Fourth Proportional to 145.12, 217.72 and 72.92

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Solution

The fourth proportional to 145.12, 217.72 and 72.92 is: 109.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.12 : 217.72 = 72.92 : x
  2. Step 2: Convert to fraction form
    145.12/217.72 = 72.92/x
  3. Step 3: Cross multiply
    145.12x = 217.72 × 72.92
  4. Step 4: Simplify right side
    145.12x = 15,876.14
  5. Step 5: Solve for x
    x = 15,876.14/145.12
  6. Step 6: Final answer
    x = 109.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.