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Finding the Fourth Proportional to 90,004.80, 135,007.20 and 88,692.60

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Solution

The fourth proportional to 90,004.80, 135,007.20 and 88,692.60 is: 133,038.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,004.80 : 135,007.20 = 88,692.60 : x
  2. Step 2: Convert to fraction form
    90,004.80/135,007.20 = 88,692.60/x
  3. Step 3: Cross multiply
    90,004.80x = 135,007.20 × 88,692.60
  4. Step 4: Simplify right side
    90,004.80x = 11,974,139,586.72
  5. Step 5: Solve for x
    x = 11,974,139,586.72/90,004.80
  6. Step 6: Final answer
    x = 133,038.90

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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.