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Finding the Fourth Proportional to 40,820.70, 61,216.65 and 18,644.70

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Solution

The fourth proportional to 40,820.70, 61,216.65 and 18,644.70 is: 27,960.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,820.70 : 61,216.65 = 18,644.70 : x
  2. Step 2: Convert to fraction form
    40,820.70/61,216.65 = 18,644.70/x
  3. Step 3: Cross multiply
    40,820.70x = 61,216.65 × 18,644.70
  4. Step 4: Simplify right side
    40,820.70x = 1,141,366,074.26
  5. Step 5: Solve for x
    x = 1,141,366,074.26/40,820.70
  6. Step 6: Final answer
    x = 27,960.47

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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.