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Finding the Fourth Proportional to 272,686.60, 409,029.90 and 85,697.80

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Solution

The fourth proportional to 272,686.60, 409,029.90 and 85,697.80 is: 128,546.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    272,686.60 : 409,029.90 = 85,697.80 : x
  2. Step 2: Convert to fraction form
    272,686.60/409,029.90 = 85,697.80/x
  3. Step 3: Cross multiply
    272,686.60x = 409,029.90 × 85,697.80
  4. Step 4: Simplify right side
    272,686.60x = 35,052,962,564.22
  5. Step 5: Solve for x
    x = 35,052,962,564.22/272,686.60
  6. Step 6: Final answer
    x = 128,546.70

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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.