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Finding the Fourth Proportional to 302.69, 417.12 and 215.21

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Solution

The fourth proportional to 302.69, 417.12 and 215.21 is: 296.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    302.69 : 417.12 = 215.21 : x
  2. Step 2: Convert to fraction form
    302.69/417.12 = 215.21/x
  3. Step 3: Cross multiply
    302.69x = 417.12 × 215.21
  4. Step 4: Simplify right side
    302.69x = 89,768.10
  5. Step 5: Solve for x
    x = 89,768.10/302.69
  6. Step 6: Final answer
    x = 296.57

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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.