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Finding the Fourth Proportional to 85,424.31, 128,094.57 and 49,894.56

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Solution

The fourth proportional to 85,424.31, 128,094.57 and 49,894.56 is: 74,817.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,424.31 : 128,094.57 = 49,894.56 : x
  2. Step 2: Convert to fraction form
    85,424.31/128,094.57 = 49,894.56/x
  3. Step 3: Cross multiply
    85,424.31x = 128,094.57 × 49,894.56
  4. Step 4: Simplify right side
    85,424.31x = 6,391,222,208.54
  5. Step 5: Solve for x
    x = 6,391,222,208.54/85,424.31
  6. Step 6: Final answer
    x = 74,817.37

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1.5x scale

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.