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Finding the Fourth Proportional to 66,389.36, 91,621.84 and 40,558.96

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Solution

The fourth proportional to 66,389.36, 91,621.84 and 40,558.96 is: 55,974.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,389.36 : 91,621.84 = 40,558.96 : x
  2. Step 2: Convert to fraction form
    66,389.36/91,621.84 = 40,558.96/x
  3. Step 3: Cross multiply
    66,389.36x = 91,621.84 × 40,558.96
  4. Step 4: Simplify right side
    66,389.36x = 3,716,086,543.69
  5. Step 5: Solve for x
    x = 3,716,086,543.69/66,389.36
  6. Step 6: Final answer
    x = 55,974.13

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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.