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Finding the Fourth Proportional to 91,212.40, 136,818.60 and 74,809.90

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Solution

The fourth proportional to 91,212.40, 136,818.60 and 74,809.90 is: 112,214.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,212.40 : 136,818.60 = 74,809.90 : x
  2. Step 2: Convert to fraction form
    91,212.40/136,818.60 = 74,809.90/x
  3. Step 3: Cross multiply
    91,212.40x = 136,818.60 × 74,809.90
  4. Step 4: Simplify right side
    91,212.40x = 10,235,385,784.14
  5. Step 5: Solve for x
    x = 10,235,385,784.14/91,212.40
  6. Step 6: Final answer
    x = 112,214.85

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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.