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Finding the Fourth Proportional to 85,972.88, 128,900.50 and 43,771.30

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Solution

The fourth proportional to 85,972.88, 128,900.50 and 43,771.30 is: 65,627.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,972.88 : 128,900.50 = 43,771.30 : x
  2. Step 2: Convert to fraction form
    85,972.88/128,900.50 = 43,771.30/x
  3. Step 3: Cross multiply
    85,972.88x = 128,900.50 × 43,771.30
  4. Step 4: Simplify right side
    85,972.88x = 5,642,142,023.97
  5. Step 5: Solve for x
    x = 5,642,142,023.97/85,972.88
  6. Step 6: Final answer
    x = 65,627.00

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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.