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Finding the Fourth Proportional to 15,118.96, 20,867.55 and 8,406.94

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Solution

The fourth proportional to 15,118.96, 20,867.55 and 8,406.94 is: 11,603.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,118.96 : 20,867.55 = 8,406.94 : x
  2. Step 2: Convert to fraction form
    15,118.96/20,867.55 = 8,406.94/x
  3. Step 3: Cross multiply
    15,118.96x = 20,867.55 × 8,406.94
  4. Step 4: Simplify right side
    15,118.96x = 175,432,240.80
  5. Step 5: Solve for x
    x = 175,432,240.80/15,118.96
  6. Step 6: Final answer
    x = 11,603.46

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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.