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Finding the Fourth Proportional to 19,045.81, 28,578.44 and 8,656.21

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Solution

The fourth proportional to 19,045.81, 28,578.44 and 8,656.21 is: 12,988.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,045.81 : 28,578.44 = 8,656.21 : x
  2. Step 2: Convert to fraction form
    19,045.81/28,578.44 = 8,656.21/x
  3. Step 3: Cross multiply
    19,045.81x = 28,578.44 × 8,656.21
  4. Step 4: Simplify right side
    19,045.81x = 247,380,978.11
  5. Step 5: Solve for x
    x = 247,380,978.11/19,045.81
  6. Step 6: Final answer
    x = 12,988.73

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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.