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Finding the Fourth Proportional to 272,898.90, 409,348.35 and 85,910.40

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Solution

The fourth proportional to 272,898.90, 409,348.35 and 85,910.40 is: 128,865.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    272,898.90 : 409,348.35 = 85,910.40 : x
  2. Step 2: Convert to fraction form
    272,898.90/409,348.35 = 85,910.40/x
  3. Step 3: Cross multiply
    272,898.90x = 409,348.35 × 85,910.40
  4. Step 4: Simplify right side
    272,898.90x = 35,167,280,487.84
  5. Step 5: Solve for x
    x = 35,167,280,487.84/272,898.90
  6. Step 6: Final answer
    x = 128,865.60

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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.