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Finding the Fourth Proportional to 272,872.10, 409,308.15 and 85,859.30

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Solution

The fourth proportional to 272,872.10, 409,308.15 and 85,859.30 is: 128,788.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    272,872.10 : 409,308.15 = 85,859.30 : x
  2. Step 2: Convert to fraction form
    272,872.10/409,308.15 = 85,859.30/x
  3. Step 3: Cross multiply
    272,872.10x = 409,308.15 × 85,859.30
  4. Step 4: Simplify right side
    272,872.10x = 35,142,911,243.30
  5. Step 5: Solve for x
    x = 35,142,911,243.30/272,872.10
  6. Step 6: Final answer
    x = 128,788.95

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.