Home / 20,385.36-28,133.60-11,432.79

Finding the Fourth Proportional to 20,385.36, 28,133.60 and 11,432.79

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Solution

The fourth proportional to 20,385.36, 28,133.60 and 11,432.79 is: 15,778.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,385.36 : 28,133.60 = 11,432.79 : x
  2. Step 2: Convert to fraction form
    20,385.36/28,133.60 = 11,432.79/x
  3. Step 3: Cross multiply
    20,385.36x = 28,133.60 × 11,432.79
  4. Step 4: Simplify right side
    20,385.36x = 321,645,483.58
  5. Step 5: Solve for x
    x = 321,645,483.58/20,385.36
  6. Step 6: Final answer
    x = 15,778.26

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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.