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Finding the Fourth Proportional to 15,119.16, 20,866.16 and 8,405.45

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Solution

The fourth proportional to 15,119.16, 20,866.16 and 8,405.45 is: 11,600.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,119.16 : 20,866.16 = 8,405.45 : x
  2. Step 2: Convert to fraction form
    15,119.16/20,866.16 = 8,405.45/x
  3. Step 3: Cross multiply
    15,119.16x = 20,866.16 × 8,405.45
  4. Step 4: Simplify right side
    15,119.16x = 175,389,464.57
  5. Step 5: Solve for x
    x = 175,389,464.57/15,119.16
  6. Step 6: Final answer
    x = 11,600.48

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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.