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Finding the Fourth Proportional to 223.12, 307.90 and 124.87

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Solution

The fourth proportional to 223.12, 307.90 and 124.87 is: 172.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    223.12 : 307.90 = 124.87 : x
  2. Step 2: Convert to fraction form
    223.12/307.90 = 124.87/x
  3. Step 3: Cross multiply
    223.12x = 307.90 × 124.87
  4. Step 4: Simplify right side
    223.12x = 38,447.47
  5. Step 5: Solve for x
    x = 38,447.47/223.12
  6. Step 6: Final answer
    x = 172.32

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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.