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Finding the Fourth Proportional to 20,420.99, 30,604.22 and 10,913.81

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Solution

The fourth proportional to 20,420.99, 30,604.22 and 10,913.81 is: 16,356.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,420.99 : 30,604.22 = 10,913.81 : x
  2. Step 2: Convert to fraction form
    20,420.99/30,604.22 = 10,913.81/x
  3. Step 3: Cross multiply
    20,420.99x = 30,604.22 × 10,913.81
  4. Step 4: Simplify right side
    20,420.99x = 334,008,746.07
  5. Step 5: Solve for x
    x = 334,008,746.07/20,420.99
  6. Step 6: Final answer
    x = 16,356.15

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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.