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Finding the Fourth Proportional to 85,982.60, 128,930.70 and 39,182.60

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Solution

The fourth proportional to 85,982.60, 128,930.70 and 39,182.60 is: 58,754.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,982.60 : 128,930.70 = 39,182.60 : x
  2. Step 2: Convert to fraction form
    85,982.60/128,930.70 = 39,182.60/x
  3. Step 3: Cross multiply
    85,982.60x = 128,930.70 × 39,182.60
  4. Step 4: Simplify right side
    85,982.60x = 5,051,840,045.82
  5. Step 5: Solve for x
    x = 5,051,840,045.82/85,982.60
  6. Step 6: Final answer
    x = 58,754.21

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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.