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Finding the Fourth Proportional to 18,986.32, 28,489.76 and 7,900.64

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Solution

The fourth proportional to 18,986.32, 28,489.76 and 7,900.64 is: 11,855.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,986.32 : 28,489.76 = 7,900.64 : x
  2. Step 2: Convert to fraction form
    18,986.32/28,489.76 = 7,900.64/x
  3. Step 3: Cross multiply
    18,986.32x = 28,489.76 × 7,900.64
  4. Step 4: Simplify right side
    18,986.32x = 225,087,337.45
  5. Step 5: Solve for x
    x = 225,087,337.45/18,986.32
  6. Step 6: Final answer
    x = 11,855.24

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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.