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Finding the Fourth Proportional to 90,641.70, 135,945.54 and 38,051.64

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Solution

The fourth proportional to 90,641.70, 135,945.54 and 38,051.64 is: 57,070.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,641.70 : 135,945.54 = 38,051.64 : x
  2. Step 2: Convert to fraction form
    90,641.70/135,945.54 = 38,051.64/x
  3. Step 3: Cross multiply
    90,641.70x = 135,945.54 × 38,051.64
  4. Step 4: Simplify right side
    90,641.70x = 5,172,950,747.69
  5. Step 5: Solve for x
    x = 5,172,950,747.69/90,641.70
  6. Step 6: Final answer
    x = 57,070.32

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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.