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Finding the Fourth Proportional to 66,128.70, 91,257.66 and 35,913.90

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Solution

The fourth proportional to 66,128.70, 91,257.66 and 35,913.90 is: 49,561.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,128.70 : 91,257.66 = 35,913.90 : x
  2. Step 2: Convert to fraction form
    66,128.70/91,257.66 = 35,913.90/x
  3. Step 3: Cross multiply
    66,128.70x = 91,257.66 × 35,913.90
  4. Step 4: Simplify right side
    66,128.70x = 3,277,418,475.47
  5. Step 5: Solve for x
    x = 3,277,418,475.47/66,128.70
  6. Step 6: Final answer
    x = 49,561.21

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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.