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Finding the Fourth Proportional to 219.12, 302.16 and 153.48

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Solution

The fourth proportional to 219.12, 302.16 and 153.48 is: 211.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.12 : 302.16 = 153.48 : x
  2. Step 2: Convert to fraction form
    219.12/302.16 = 153.48/x
  3. Step 3: Cross multiply
    219.12x = 302.16 × 153.48
  4. Step 4: Simplify right side
    219.12x = 46,375.52
  5. Step 5: Solve for x
    x = 46,375.52/219.12
  6. Step 6: Final answer
    x = 211.64

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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.