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Finding the Fourth Proportional to 91,221.10, 136,503.60 and 61,696.60

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Solution

The fourth proportional to 91,221.10, 136,503.60 and 61,696.60 is: 92,323.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,221.10 : 136,503.60 = 61,696.60 : x
  2. Step 2: Convert to fraction form
    91,221.10/136,503.60 = 61,696.60/x
  3. Step 3: Cross multiply
    91,221.10x = 136,503.60 × 61,696.60
  4. Step 4: Simplify right side
    91,221.10x = 8,421,808,007.76
  5. Step 5: Solve for x
    x = 8,421,808,007.76/91,221.10
  6. Step 6: Final answer
    x = 92,323.03

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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.