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Finding the Fourth Proportional to 18,920.64, 28,380.96 and 6,605.76

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Solution

The fourth proportional to 18,920.64, 28,380.96 and 6,605.76 is: 9,908.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,920.64 : 28,380.96 = 6,605.76 : x
  2. Step 2: Convert to fraction form
    18,920.64/28,380.96 = 6,605.76/x
  3. Step 3: Cross multiply
    18,920.64x = 28,380.96 × 6,605.76
  4. Step 4: Simplify right side
    18,920.64x = 187,477,810.33
  5. Step 5: Solve for x
    x = 187,477,810.33/18,920.64
  6. Step 6: Final answer
    x = 9,908.64

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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.