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Finding the Fourth Proportional to 221,530.80, 305,672.17 and 124,719.60

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Solution

The fourth proportional to 221,530.80, 305,672.17 and 124,719.60 is: 172,090.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,530.80 : 305,672.17 = 124,719.60 : x
  2. Step 2: Convert to fraction form
    221,530.80/305,672.17 = 124,719.60/x
  3. Step 3: Cross multiply
    221,530.80x = 305,672.17 × 124,719.60
  4. Step 4: Simplify right side
    221,530.80x = 38,123,309,401.07
  5. Step 5: Solve for x
    x = 38,123,309,401.07/221,530.80
  6. Step 6: Final answer
    x = 172,090.34

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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.