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Finding the Fourth Proportional to 91,690.60, 137,730.30 and 88,385.80

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Solution

The fourth proportional to 91,690.60, 137,730.30 and 88,385.80 is: 132,766.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,690.60 : 137,730.30 = 88,385.80 : x
  2. Step 2: Convert to fraction form
    91,690.60/137,730.30 = 88,385.80/x
  3. Step 3: Cross multiply
    91,690.60x = 137,730.30 × 88,385.80
  4. Step 4: Simplify right side
    91,690.60x = 12,173,402,749.74
  5. Step 5: Solve for x
    x = 12,173,402,749.74/91,690.60
  6. Step 6: Final answer
    x = 132,766.09

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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.