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Finding the Fourth Proportional to 13,425.76, 18,538.60 and 8,718.08

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Solution

The fourth proportional to 13,425.76, 18,538.60 and 8,718.08 is: 12,038.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,425.76 : 18,538.60 = 8,718.08 : x
  2. Step 2: Convert to fraction form
    13,425.76/18,538.60 = 8,718.08/x
  3. Step 3: Cross multiply
    13,425.76x = 18,538.60 × 8,718.08
  4. Step 4: Simplify right side
    13,425.76x = 161,620,997.89
  5. Step 5: Solve for x
    x = 161,620,997.89/13,425.76
  6. Step 6: Final answer
    x = 12,038.13

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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.