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Finding the Fourth Proportional to 40,891.70, 61,376.70 and 21,184.40

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Solution

The fourth proportional to 40,891.70, 61,376.70 and 21,184.40 is: 31,796.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,891.70 : 61,376.70 = 21,184.40 : x
  2. Step 2: Convert to fraction form
    40,891.70/61,376.70 = 21,184.40/x
  3. Step 3: Cross multiply
    40,891.70x = 61,376.70 × 21,184.40
  4. Step 4: Simplify right side
    40,891.70x = 1,300,228,563.48
  5. Step 5: Solve for x
    x = 1,300,228,563.48/40,891.70
  6. Step 6: Final answer
    x = 31,796.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.