Home / 20,565.28-28,380-11,612.68

Finding the Fourth Proportional to 20,565.28, 28,380 and 11,612.68

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Solution

The fourth proportional to 20,565.28, 28,380 and 11,612.68 is: 16,025.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,565.28 : 28,380 = 11,612.68 : x
  2. Step 2: Convert to fraction form
    20,565.28/28,380 = 11,612.68/x
  3. Step 3: Cross multiply
    20,565.28x = 28,380 × 11,612.68
  4. Step 4: Simplify right side
    20,565.28x = 329,567,858.40
  5. Step 5: Solve for x
    x = 329,567,858.40/20,565.28
  6. Step 6: Final answer
    x = 16,025.45

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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.