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Finding the Fourth Proportional to 15,187.74, 20,956.86 and 9,218.40

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Solution

The fourth proportional to 15,187.74, 20,956.86 and 9,218.40 is: 12,720.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,187.74 : 20,956.86 = 9,218.40 : x
  2. Step 2: Convert to fraction form
    15,187.74/20,956.86 = 9,218.40/x
  3. Step 3: Cross multiply
    15,187.74x = 20,956.86 × 9,218.40
  4. Step 4: Simplify right side
    15,187.74x = 193,188,718.22
  5. Step 5: Solve for x
    x = 193,188,718.22/15,187.74
  6. Step 6: Final answer
    x = 12,720.04

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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.