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Finding the Fourth Proportional to 308.60, 425.01 and 215.19

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Solution

The fourth proportional to 308.60, 425.01 and 215.19 is: 296.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.60 : 425.01 = 215.19 : x
  2. Step 2: Convert to fraction form
    308.60/425.01 = 215.19/x
  3. Step 3: Cross multiply
    308.60x = 425.01 × 215.19
  4. Step 4: Simplify right side
    308.60x = 91,457.90
  5. Step 5: Solve for x
    x = 91,457.90/308.60
  6. Step 6: Final answer
    x = 296.36

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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.