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Finding the Fourth Proportional to 15,139.70, 20,893.39 and 9,168

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Solution

The fourth proportional to 15,139.70, 20,893.39 and 9,168 is: 12,652.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,139.70 : 20,893.39 = 9,168 : x
  2. Step 2: Convert to fraction form
    15,139.70/20,893.39 = 9,168/x
  3. Step 3: Cross multiply
    15,139.70x = 20,893.39 × 9,168
  4. Step 4: Simplify right side
    15,139.70x = 191,550,599.52
  5. Step 5: Solve for x
    x = 191,550,599.52/15,139.70
  6. Step 6: Final answer
    x = 12,652.21

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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.