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Finding the Fourth Proportional to 85,763.34, 128,723.46 and 43,672.50

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Solution

The fourth proportional to 85,763.34, 128,723.46 and 43,672.50 is: 65,548.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,763.34 : 128,723.46 = 43,672.50 : x
  2. Step 2: Convert to fraction form
    85,763.34/128,723.46 = 43,672.50/x
  3. Step 3: Cross multiply
    85,763.34x = 128,723.46 × 43,672.50
  4. Step 4: Simplify right side
    85,763.34x = 5,621,675,306.85
  5. Step 5: Solve for x
    x = 5,621,675,306.85/85,763.34
  6. Step 6: Final answer
    x = 65,548.70

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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.