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Finding the Fourth Proportional to 13,220.61, 18,247.61 and 8,978.74

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Solution

The fourth proportional to 13,220.61, 18,247.61 and 8,978.74 is: 12,392.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,220.61 : 18,247.61 = 8,978.74 : x
  2. Step 2: Convert to fraction form
    13,220.61/18,247.61 = 8,978.74/x
  3. Step 3: Cross multiply
    13,220.61x = 18,247.61 × 8,978.74
  4. Step 4: Simplify right side
    13,220.61x = 163,840,454.57
  5. Step 5: Solve for x
    x = 163,840,454.57/13,220.61
  6. Step 6: Final answer
    x = 12,392.81

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.