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Finding the Fourth Proportional to 66,990.97, 92,428.60 and 43,131.46

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Solution

The fourth proportional to 66,990.97, 92,428.60 and 43,131.46 is: 59,509.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,990.97 : 92,428.60 = 43,131.46 : x
  2. Step 2: Convert to fraction form
    66,990.97/92,428.60 = 43,131.46/x
  3. Step 3: Cross multiply
    66,990.97x = 92,428.60 × 43,131.46
  4. Step 4: Simplify right side
    66,990.97x = 3,986,580,463.76
  5. Step 5: Solve for x
    x = 3,986,580,463.76/66,990.97
  6. Step 6: Final answer
    x = 59,509.22

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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.