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Finding the Fourth Proportional to 61,976.80, 92,965.20 and 20,418.40

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Solution

The fourth proportional to 61,976.80, 92,965.20 and 20,418.40 is: 30,627.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,976.80 : 92,965.20 = 20,418.40 : x
  2. Step 2: Convert to fraction form
    61,976.80/92,965.20 = 20,418.40/x
  3. Step 3: Cross multiply
    61,976.80x = 92,965.20 × 20,418.40
  4. Step 4: Simplify right side
    61,976.80x = 1,898,200,639.68
  5. Step 5: Solve for x
    x = 1,898,200,639.68/61,976.80
  6. Step 6: Final answer
    x = 30,627.60

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1.5x scale

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.