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Finding the Fourth Proportional to 12,489.72, 17,236.05 and 6,900.72

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Solution

The fourth proportional to 12,489.72, 17,236.05 and 6,900.72 is: 9,523.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,489.72 : 17,236.05 = 6,900.72 : x
  2. Step 2: Convert to fraction form
    12,489.72/17,236.05 = 6,900.72/x
  3. Step 3: Cross multiply
    12,489.72x = 17,236.05 × 6,900.72
  4. Step 4: Simplify right side
    12,489.72x = 118,941,154.96
  5. Step 5: Solve for x
    x = 118,941,154.96/12,489.72
  6. Step 6: Final answer
    x = 9,523.12

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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.