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Finding the Fourth Proportional to 56,678.80, 84,964.20 and 21,130.60

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Solution

The fourth proportional to 56,678.80, 84,964.20 and 21,130.60 is: 31,675.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,678.80 : 84,964.20 = 21,130.60 : x
  2. Step 2: Convert to fraction form
    56,678.80/84,964.20 = 21,130.60/x
  3. Step 3: Cross multiply
    56,678.80x = 84,964.20 × 21,130.60
  4. Step 4: Simplify right side
    56,678.80x = 1,795,344,524.52
  5. Step 5: Solve for x
    x = 1,795,344,524.52/56,678.80
  6. Step 6: Final answer
    x = 31,675.77

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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.