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Finding the Fourth Proportional to 90,445.02, 135,758.70 and 79,983.84

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Solution

The fourth proportional to 90,445.02, 135,758.70 and 79,983.84 is: 120,056.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,445.02 : 135,758.70 = 79,983.84 : x
  2. Step 2: Convert to fraction form
    90,445.02/135,758.70 = 79,983.84/x
  3. Step 3: Cross multiply
    90,445.02x = 135,758.70 × 79,983.84
  4. Step 4: Simplify right side
    90,445.02x = 10,858,502,139.41
  5. Step 5: Solve for x
    x = 10,858,502,139.41/90,445.02
  6. Step 6: Final answer
    x = 120,056.38

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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.