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Finding the Fourth Proportional to 20,423.68, 30,664.68 and 11,669.20

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Solution

The fourth proportional to 20,423.68, 30,664.68 and 11,669.20 is: 17,520.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,423.68 : 30,664.68 = 11,669.20 : x
  2. Step 2: Convert to fraction form
    20,423.68/30,664.68 = 11,669.20/x
  3. Step 3: Cross multiply
    20,423.68x = 30,664.68 × 11,669.20
  4. Step 4: Simplify right side
    20,423.68x = 357,832,283.86
  5. Step 5: Solve for x
    x = 357,832,283.86/20,423.68
  6. Step 6: Final answer
    x = 17,520.46

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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.