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Finding the Fourth Proportional to 20,933.60, 31,390.80 and 9,240.80

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Solution

The fourth proportional to 20,933.60, 31,390.80 and 9,240.80 is: 13,856.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,933.60 : 31,390.80 = 9,240.80 : x
  2. Step 2: Convert to fraction form
    20,933.60/31,390.80 = 9,240.80/x
  3. Step 3: Cross multiply
    20,933.60x = 31,390.80 × 9,240.80
  4. Step 4: Simplify right side
    20,933.60x = 290,076,104.64
  5. Step 5: Solve for x
    x = 290,076,104.64/20,933.60
  6. Step 6: Final answer
    x = 13,856.96

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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.