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Finding the Fourth Proportional to 66,490.78, 91,749.03 and 40,662.31

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Solution

The fourth proportional to 66,490.78, 91,749.03 and 40,662.31 is: 56,108.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,490.78 : 91,749.03 = 40,662.31 : x
  2. Step 2: Convert to fraction form
    66,490.78/91,749.03 = 40,662.31/x
  3. Step 3: Cross multiply
    66,490.78x = 91,749.03 × 40,662.31
  4. Step 4: Simplify right side
    66,490.78x = 3,730,727,500.06
  5. Step 5: Solve for x
    x = 3,730,727,500.06/66,490.78
  6. Step 6: Final answer
    x = 56,108.94

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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.