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Finding the Fourth Proportional to 18,311.80, 25,270.05 and 9,928.30

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Solution

The fourth proportional to 18,311.80, 25,270.05 and 9,928.30 is: 13,700.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,311.80 : 25,270.05 = 9,928.30 : x
  2. Step 2: Convert to fraction form
    18,311.80/25,270.05 = 9,928.30/x
  3. Step 3: Cross multiply
    18,311.80x = 25,270.05 × 9,928.30
  4. Step 4: Simplify right side
    18,311.80x = 250,888,637.42
  5. Step 5: Solve for x
    x = 250,888,637.42/18,311.80
  6. Step 6: Final answer
    x = 13,700.93

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.