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Finding the Fourth Proportional to 30,620.80, 45,930.12 and 12,152.80

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Solution

The fourth proportional to 30,620.80, 45,930.12 and 12,152.80 is: 18,228.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,620.80 : 45,930.12 = 12,152.80 : x
  2. Step 2: Convert to fraction form
    30,620.80/45,930.12 = 12,152.80/x
  3. Step 3: Cross multiply
    30,620.80x = 45,930.12 × 12,152.80
  4. Step 4: Simplify right side
    30,620.80x = 558,179,562.34
  5. Step 5: Solve for x
    x = 558,179,562.34/30,620.80
  6. Step 6: Final answer
    x = 18,228.77

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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.