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Finding the Fourth Proportional to 12,390.68, 18,571.98 and 6,155.04

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Solution

The fourth proportional to 12,390.68, 18,571.98 and 6,155.04 is: 9,225.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,390.68 : 18,571.98 = 6,155.04 : x
  2. Step 2: Convert to fraction form
    12,390.68/18,571.98 = 6,155.04/x
  3. Step 3: Cross multiply
    12,390.68x = 18,571.98 × 6,155.04
  4. Step 4: Simplify right side
    12,390.68x = 114,311,279.78
  5. Step 5: Solve for x
    x = 114,311,279.78/12,390.68
  6. Step 6: Final answer
    x = 9,225.59

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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.