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Finding the Fourth Proportional to 15,059.81, 20,783.45 and 8,686.28

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Solution

The fourth proportional to 15,059.81, 20,783.45 and 8,686.28 is: 11,987.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,059.81 : 20,783.45 = 8,686.28 : x
  2. Step 2: Convert to fraction form
    15,059.81/20,783.45 = 8,686.28/x
  3. Step 3: Cross multiply
    15,059.81x = 20,783.45 × 8,686.28
  4. Step 4: Simplify right side
    15,059.81x = 180,530,874.59
  5. Step 5: Solve for x
    x = 180,530,874.59/15,059.81
  6. Step 6: Final answer
    x = 11,987.60

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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.