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Finding the Fourth Proportional to 30,405.38, 45,607.86 and 8,220.99

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Solution

The fourth proportional to 30,405.38, 45,607.86 and 8,220.99 is: 12,331.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,405.38 : 45,607.86 = 8,220.99 : x
  2. Step 2: Convert to fraction form
    30,405.38/45,607.86 = 8,220.99/x
  3. Step 3: Cross multiply
    30,405.38x = 45,607.86 × 8,220.99
  4. Step 4: Simplify right side
    30,405.38x = 374,941,932.01
  5. Step 5: Solve for x
    x = 374,941,932.01/30,405.38
  6. Step 6: Final answer
    x = 12,331.44

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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.