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Finding the Fourth Proportional to 302.48, 417.80 and 209.06

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Solution

The fourth proportional to 302.48, 417.80 and 209.06 is: 288.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    302.48 : 417.80 = 209.06 : x
  2. Step 2: Convert to fraction form
    302.48/417.80 = 209.06/x
  3. Step 3: Cross multiply
    302.48x = 417.80 × 209.06
  4. Step 4: Simplify right side
    302.48x = 87,342.13
  5. Step 5: Solve for x
    x = 87,342.13/302.48
  6. Step 6: Final answer
    x = 288.76

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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.