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Finding the Fourth Proportional to 66,411.36, 91,672.20 and 40,921.92

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Solution

The fourth proportional to 66,411.36, 91,672.20 and 40,921.92 is: 56,487.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,411.36 : 91,672.20 = 40,921.92 : x
  2. Step 2: Convert to fraction form
    66,411.36/91,672.20 = 40,921.92/x
  3. Step 3: Cross multiply
    66,411.36x = 91,672.20 × 40,921.92
  4. Step 4: Simplify right side
    66,411.36x = 3,751,402,434.62
  5. Step 5: Solve for x
    x = 3,751,402,434.62/66,411.36
  6. Step 6: Final answer
    x = 56,487.36

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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.