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Finding the Fourth Proportional to 223.80, 308.75 and 153.87

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Solution

The fourth proportional to 223.80, 308.75 and 153.87 is: 212.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    223.80 : 308.75 = 153.87 : x
  2. Step 2: Convert to fraction form
    223.80/308.75 = 153.87/x
  3. Step 3: Cross multiply
    223.80x = 308.75 × 153.87
  4. Step 4: Simplify right side
    223.80x = 47,507.36
  5. Step 5: Solve for x
    x = 47,507.36/223.80
  6. Step 6: Final answer
    x = 212.28

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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.