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Finding the Fourth Proportional to 90,809.68, 135,986.04 and 57,428.56

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Solution

The fourth proportional to 90,809.68, 135,986.04 and 57,428.56 is: 85,998.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,809.68 : 135,986.04 = 57,428.56 : x
  2. Step 2: Convert to fraction form
    90,809.68/135,986.04 = 57,428.56/x
  3. Step 3: Cross multiply
    90,809.68x = 135,986.04 × 57,428.56
  4. Step 4: Simplify right side
    90,809.68x = 7,809,482,457.30
  5. Step 5: Solve for x
    x = 7,809,482,457.30/90,809.68
  6. Step 6: Final answer
    x = 85,998.35

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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.