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Finding the Fourth Proportional to 91,104.60, 136,656.90 and 87,605.40

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Solution

The fourth proportional to 91,104.60, 136,656.90 and 87,605.40 is: 131,408.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,104.60 : 136,656.90 = 87,605.40 : x
  2. Step 2: Convert to fraction form
    91,104.60/136,656.90 = 87,605.40/x
  3. Step 3: Cross multiply
    91,104.60x = 136,656.90 × 87,605.40
  4. Step 4: Simplify right side
    91,104.60x = 11,971,882,387.26
  5. Step 5: Solve for x
    x = 11,971,882,387.26/91,104.60
  6. Step 6: Final answer
    x = 131,408.10

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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.