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Finding the Fourth Proportional to 66,556.56, 91,721.28 and 47,660.88

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Solution

The fourth proportional to 66,556.56, 91,721.28 and 47,660.88 is: 65,681.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,556.56 : 91,721.28 = 47,660.88 : x
  2. Step 2: Convert to fraction form
    66,556.56/91,721.28 = 47,660.88/x
  3. Step 3: Cross multiply
    66,556.56x = 91,721.28 × 47,660.88
  4. Step 4: Simplify right side
    66,556.56x = 4,371,516,919.53
  5. Step 5: Solve for x
    x = 4,371,516,919.53/66,556.56
  6. Step 6: Final answer
    x = 65,681.23

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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.