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Finding the Fourth Proportional to 18,969.81, 28,458.06 and 6,486.90

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Solution

The fourth proportional to 18,969.81, 28,458.06 and 6,486.90 is: 9,731.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,969.81 : 28,458.06 = 6,486.90 : x
  2. Step 2: Convert to fraction form
    18,969.81/28,458.06 = 6,486.90/x
  3. Step 3: Cross multiply
    18,969.81x = 28,458.06 × 6,486.90
  4. Step 4: Simplify right side
    18,969.81x = 184,604,589.41
  5. Step 5: Solve for x
    x = 184,604,589.41/18,969.81
  6. Step 6: Final answer
    x = 9,731.49

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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.