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Finding the Fourth Proportional to 85,238.45, 117,679.50 and 75,780.89

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Solution

The fourth proportional to 85,238.45, 117,679.50 and 75,780.89 is: 104,622.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,238.45 : 117,679.50 = 75,780.89 : x
  2. Step 2: Convert to fraction form
    85,238.45/117,679.50 = 75,780.89/x
  3. Step 3: Cross multiply
    85,238.45x = 117,679.50 × 75,780.89
  4. Step 4: Simplify right side
    85,238.45x = 8,917,856,656.36
  5. Step 5: Solve for x
    x = 8,917,856,656.36/85,238.45
  6. Step 6: Final answer
    x = 104,622.47

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.