Home / 12,138.30-18,213.12-4,740.84

Finding the Fourth Proportional to 12,138.30, 18,213.12 and 4,740.84

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Solution

The fourth proportional to 12,138.30, 18,213.12 and 4,740.84 is: 7,113.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,138.30 : 18,213.12 = 4,740.84 : x
  2. Step 2: Convert to fraction form
    12,138.30/18,213.12 = 4,740.84/x
  3. Step 3: Cross multiply
    12,138.30x = 18,213.12 × 4,740.84
  4. Step 4: Simplify right side
    12,138.30x = 86,345,487.82
  5. Step 5: Solve for x
    x = 86,345,487.82/12,138.30
  6. Step 6: Final answer
    x = 7,113.47

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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.