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Finding the Fourth Proportional to 12,149.80, 18,210.30 and 5,129.80

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Solution

The fourth proportional to 12,149.80, 18,210.30 and 5,129.80 is: 7,688.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,149.80 : 18,210.30 = 5,129.80 : x
  2. Step 2: Convert to fraction form
    12,149.80/18,210.30 = 5,129.80/x
  3. Step 3: Cross multiply
    12,149.80x = 18,210.30 × 5,129.80
  4. Step 4: Simplify right side
    12,149.80x = 93,415,196.94
  5. Step 5: Solve for x
    x = 93,415,196.94/12,149.80
  6. Step 6: Final answer
    x = 7,688.62

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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.