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Finding the Fourth Proportional to 91,137.60, 136,738.80 and 87,897.60

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Solution

The fourth proportional to 91,137.60, 136,738.80 and 87,897.60 is: 131,877.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,137.60 : 136,738.80 = 87,897.60 : x
  2. Step 2: Convert to fraction form
    91,137.60/136,738.80 = 87,897.60/x
  3. Step 3: Cross multiply
    91,137.60x = 136,738.80 × 87,897.60
  4. Step 4: Simplify right side
    91,137.60x = 12,019,012,346.88
  5. Step 5: Solve for x
    x = 12,019,012,346.88/91,137.60
  6. Step 6: Final answer
    x = 131,877.65

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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.