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Finding the Fourth Proportional to 85,790, 128,736.84 and 36,542

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Solution

The fourth proportional to 85,790, 128,736.84 and 36,542 is: 54,835.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,790 : 128,736.84 = 36,542 : x
  2. Step 2: Convert to fraction form
    85,790/128,736.84 = 36,542/x
  3. Step 3: Cross multiply
    85,790x = 128,736.84 × 36,542
  4. Step 4: Simplify right side
    85,790x = 4,704,301,607.28
  5. Step 5: Solve for x
    x = 4,704,301,607.28/85,790
  6. Step 6: Final answer
    x = 54,835.08

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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.