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Finding the Fourth Proportional to 66,640.17, 91,903.91 and 55,291.70

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Solution

The fourth proportional to 66,640.17, 91,903.91 and 55,291.70 is: 76,253.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,640.17 : 91,903.91 = 55,291.70 : x
  2. Step 2: Convert to fraction form
    66,640.17/91,903.91 = 55,291.70/x
  3. Step 3: Cross multiply
    66,640.17x = 91,903.91 × 55,291.70
  4. Step 4: Simplify right side
    66,640.17x = 5,081,522,684.57
  5. Step 5: Solve for x
    x = 5,081,522,684.57/66,640.17
  6. Step 6: Final answer
    x = 76,253.15

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.