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Finding the Fourth Proportional to 66,420.91, 91,657.51 and 37,736.81

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Solution

The fourth proportional to 66,420.91, 91,657.51 and 37,736.81 is: 52,074.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,420.91 : 91,657.51 = 37,736.81 : x
  2. Step 2: Convert to fraction form
    66,420.91/91,657.51 = 37,736.81/x
  3. Step 3: Cross multiply
    66,420.91x = 91,657.51 × 37,736.81
  4. Step 4: Simplify right side
    66,420.91x = 3,458,862,174.74
  5. Step 5: Solve for x
    x = 3,458,862,174.74/66,420.91
  6. Step 6: Final answer
    x = 52,074.90

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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.