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Finding the Fourth Proportional to 66,490.28, 91,748.34 and 40,661.81

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Solution

The fourth proportional to 66,490.28, 91,748.34 and 40,661.81 is: 56,108.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,490.28 : 91,748.34 = 40,661.81 : x
  2. Step 2: Convert to fraction form
    66,490.28/91,748.34 = 40,661.81/x
  3. Step 3: Cross multiply
    66,490.28x = 91,748.34 × 40,661.81
  4. Step 4: Simplify right side
    66,490.28x = 3,730,653,568.90
  5. Step 5: Solve for x
    x = 3,730,653,568.90/66,490.28
  6. Step 6: Final answer
    x = 56,108.25

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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.