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Finding the Fourth Proportional to 221,387.89, 305,460.94 and 129,492.88

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Solution

The fourth proportional to 221,387.89, 305,460.94 and 129,492.88 is: 178,668.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,387.89 : 305,460.94 = 129,492.88 : x
  2. Step 2: Convert to fraction form
    221,387.89/305,460.94 = 129,492.88/x
  3. Step 3: Cross multiply
    221,387.89x = 305,460.94 × 129,492.88
  4. Step 4: Simplify right side
    221,387.89x = 39,555,016,848.11
  5. Step 5: Solve for x
    x = 39,555,016,848.11/221,387.89
  6. Step 6: Final answer
    x = 178,668.39

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1.5x scale

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.