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Finding the Fourth Proportional to 218.75, 302.45 and 215.28

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Solution

The fourth proportional to 218.75, 302.45 and 215.28 is: 297.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.75 : 302.45 = 215.28 : x
  2. Step 2: Convert to fraction form
    218.75/302.45 = 215.28/x
  3. Step 3: Cross multiply
    218.75x = 302.45 × 215.28
  4. Step 4: Simplify right side
    218.75x = 65,110.36
  5. Step 5: Solve for x
    x = 65,110.36/218.75
  6. Step 6: Final answer
    x = 297.65

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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.