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Finding the Fourth Proportional to 155.43, 214.39 and 97.20

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Solution

The fourth proportional to 155.43, 214.39 and 97.20 is: 134.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.43 : 214.39 = 97.20 : x
  2. Step 2: Convert to fraction form
    155.43/214.39 = 97.20/x
  3. Step 3: Cross multiply
    155.43x = 214.39 × 97.20
  4. Step 4: Simplify right side
    155.43x = 20,838.71
  5. Step 5: Solve for x
    x = 20,838.71/155.43
  6. Step 6: Final answer
    x = 134.07

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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.