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Finding the Fourth Proportional to 56,869.80, 85,296.60 and 19,431.60

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Solution

The fourth proportional to 56,869.80, 85,296.60 and 19,431.60 is: 29,144.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,869.80 : 85,296.60 = 19,431.60 : x
  2. Step 2: Convert to fraction form
    56,869.80/85,296.60 = 19,431.60/x
  3. Step 3: Cross multiply
    56,869.80x = 85,296.60 × 19,431.60
  4. Step 4: Simplify right side
    56,869.80x = 1,657,449,412.56
  5. Step 5: Solve for x
    x = 1,657,449,412.56/56,869.80
  6. Step 6: Final answer
    x = 29,144.63

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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.