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Finding the Fourth Proportional to 91,128.40, 136,692.60 and 83,911.30

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Solution

The fourth proportional to 91,128.40, 136,692.60 and 83,911.30 is: 125,866.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,128.40 : 136,692.60 = 83,911.30 : x
  2. Step 2: Convert to fraction form
    91,128.40/136,692.60 = 83,911.30/x
  3. Step 3: Cross multiply
    91,128.40x = 136,692.60 × 83,911.30
  4. Step 4: Simplify right side
    91,128.40x = 11,470,053,766.38
  5. Step 5: Solve for x
    x = 11,470,053,766.38/91,128.40
  6. Step 6: Final answer
    x = 125,866.95

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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.