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Finding the Fourth Proportional to 91,071.36, 136,611.90 and 28,737

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Solution

The fourth proportional to 91,071.36, 136,611.90 and 28,737 is: 43,107.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,071.36 : 136,611.90 = 28,737 : x
  2. Step 2: Convert to fraction form
    91,071.36/136,611.90 = 28,737/x
  3. Step 3: Cross multiply
    91,071.36x = 136,611.90 × 28,737
  4. Step 4: Simplify right side
    91,071.36x = 3,925,816,170.30
  5. Step 5: Solve for x
    x = 3,925,816,170.30/91,071.36
  6. Step 6: Final answer
    x = 43,107.03

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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.