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Finding the Fourth Proportional to 20,406.48, 30,609.70 and 5,615.48

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Solution

The fourth proportional to 20,406.48, 30,609.70 and 5,615.48 is: 8,423.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,406.48 : 30,609.70 = 5,615.48 : x
  2. Step 2: Convert to fraction form
    20,406.48/30,609.70 = 5,615.48/x
  3. Step 3: Cross multiply
    20,406.48x = 30,609.70 × 5,615.48
  4. Step 4: Simplify right side
    20,406.48x = 171,888,158.16
  5. Step 5: Solve for x
    x = 171,888,158.16/20,406.48
  6. Step 6: Final answer
    x = 8,423.21

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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.