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Finding the Fourth Proportional to 91,201.20, 136,801.80 and 56,209.20

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Solution

The fourth proportional to 91,201.20, 136,801.80 and 56,209.20 is: 84,313.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,201.20 : 136,801.80 = 56,209.20 : x
  2. Step 2: Convert to fraction form
    91,201.20/136,801.80 = 56,209.20/x
  3. Step 3: Cross multiply
    91,201.20x = 136,801.80 × 56,209.20
  4. Step 4: Simplify right side
    91,201.20x = 7,689,519,736.56
  5. Step 5: Solve for x
    x = 7,689,519,736.56/91,201.20
  6. Step 6: Final answer
    x = 84,313.80

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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.