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Finding the Fourth Proportional to 66,540.16, 91,837.32 and 39,684.40

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Solution

The fourth proportional to 66,540.16, 91,837.32 and 39,684.40 is: 54,771.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,540.16 : 91,837.32 = 39,684.40 : x
  2. Step 2: Convert to fraction form
    66,540.16/91,837.32 = 39,684.40/x
  3. Step 3: Cross multiply
    66,540.16x = 91,837.32 × 39,684.40
  4. Step 4: Simplify right side
    66,540.16x = 3,644,508,941.81
  5. Step 5: Solve for x
    x = 3,644,508,941.81/66,540.16
  6. Step 6: Final answer
    x = 54,771.57

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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.