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Finding the Fourth Proportional to 91,069.60, 136,636.80 and 87,829.60

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Solution

The fourth proportional to 91,069.60, 136,636.80 and 87,829.60 is: 131,775.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,069.60 : 136,636.80 = 87,829.60 : x
  2. Step 2: Convert to fraction form
    91,069.60/136,636.80 = 87,829.60/x
  3. Step 3: Cross multiply
    91,069.60x = 136,636.80 × 87,829.60
  4. Step 4: Simplify right side
    91,069.60x = 12,000,755,489.28
  5. Step 5: Solve for x
    x = 12,000,755,489.28/91,069.60
  6. Step 6: Final answer
    x = 131,775.65

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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.