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Finding the Fourth Proportional to 56,979, 85,472.10 and 21,918.60

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Solution

The fourth proportional to 56,979, 85,472.10 and 21,918.60 is: 32,879.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,979 : 85,472.10 = 21,918.60 : x
  2. Step 2: Convert to fraction form
    56,979/85,472.10 = 21,918.60/x
  3. Step 3: Cross multiply
    56,979x = 85,472.10 × 21,918.60
  4. Step 4: Simplify right side
    56,979x = 1,873,428,771.06
  5. Step 5: Solve for x
    x = 1,873,428,771.06/56,979
  6. Step 6: Final answer
    x = 32,879.28

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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.