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Finding the Fourth Proportional to 61,909.80, 92,859.30 and 20,356.80

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Solution

The fourth proportional to 61,909.80, 92,859.30 and 20,356.80 is: 30,533.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,909.80 : 92,859.30 = 20,356.80 : x
  2. Step 2: Convert to fraction form
    61,909.80/92,859.30 = 20,356.80/x
  3. Step 3: Cross multiply
    61,909.80x = 92,859.30 × 20,356.80
  4. Step 4: Simplify right side
    61,909.80x = 1,890,318,198.24
  5. Step 5: Solve for x
    x = 1,890,318,198.24/61,909.80
  6. Step 6: Final answer
    x = 30,533.42

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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.