Home / 20,587.76-30,871.72-11,820.40

Finding the Fourth Proportional to 20,587.76, 30,871.72 and 11,820.40

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Solution

The fourth proportional to 20,587.76, 30,871.72 and 11,820.40 is: 17,724.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,587.76 : 30,871.72 = 11,820.40 : x
  2. Step 2: Convert to fraction form
    20,587.76/30,871.72 = 11,820.40/x
  3. Step 3: Cross multiply
    20,587.76x = 30,871.72 × 11,820.40
  4. Step 4: Simplify right side
    20,587.76x = 364,916,079.09
  5. Step 5: Solve for x
    x = 364,916,079.09/20,587.76
  6. Step 6: Final answer
    x = 17,724.90

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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.