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Finding the Fourth Proportional to 56,679.80, 84,965.70 and 21,131.60

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Solution

The fourth proportional to 56,679.80, 84,965.70 and 21,131.60 is: 31,677.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,679.80 : 84,965.70 = 21,131.60 : x
  2. Step 2: Convert to fraction form
    56,679.80/84,965.70 = 21,131.60/x
  3. Step 3: Cross multiply
    56,679.80x = 84,965.70 × 21,131.60
  4. Step 4: Simplify right side
    56,679.80x = 1,795,461,186.12
  5. Step 5: Solve for x
    x = 1,795,461,186.12/56,679.80
  6. Step 6: Final answer
    x = 31,677.27

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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.