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Finding the Fourth Proportional to 85,490.52, 128,261.70 and 60,578.84

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Solution

The fourth proportional to 85,490.52, 128,261.70 and 60,578.84 is: 90,886.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,490.52 : 128,261.70 = 60,578.84 : x
  2. Step 2: Convert to fraction form
    85,490.52/128,261.70 = 60,578.84/x
  3. Step 3: Cross multiply
    85,490.52x = 128,261.70 × 60,578.84
  4. Step 4: Simplify right side
    85,490.52x = 7,769,944,361.12
  5. Step 5: Solve for x
    x = 7,769,944,361.12/85,490.52
  6. Step 6: Final answer
    x = 90,886.62

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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.