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Finding the Fourth Proportional to 91,068.60, 136,635.30 and 87,828.60

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Solution

The fourth proportional to 91,068.60, 136,635.30 and 87,828.60 is: 131,774.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,068.60 : 136,635.30 = 87,828.60 : x
  2. Step 2: Convert to fraction form
    91,068.60/136,635.30 = 87,828.60/x
  3. Step 3: Cross multiply
    91,068.60x = 136,635.30 × 87,828.60
  4. Step 4: Simplify right side
    91,068.60x = 12,000,487,109.58
  5. Step 5: Solve for x
    x = 12,000,487,109.58/91,068.60
  6. Step 6: Final answer
    x = 131,774.15

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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.