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Finding the Fourth Proportional to 20,390.61, 30,585.90 and 5,599.59

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Solution

The fourth proportional to 20,390.61, 30,585.90 and 5,599.59 is: 8,399.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,390.61 : 30,585.90 = 5,599.59 : x
  2. Step 2: Convert to fraction form
    20,390.61/30,585.90 = 5,599.59/x
  3. Step 3: Cross multiply
    20,390.61x = 30,585.90 × 5,599.59
  4. Step 4: Simplify right side
    20,390.61x = 171,268,499.78
  5. Step 5: Solve for x
    x = 171,268,499.78/20,390.61
  6. Step 6: Final answer
    x = 8,399.38

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1.5x scale

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.