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Finding the Fourth Proportional to 18,302.70, 25,257.72 and 9,919.20

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Solution

The fourth proportional to 18,302.70, 25,257.72 and 9,919.20 is: 13,688.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,302.70 : 25,257.72 = 9,919.20 : x
  2. Step 2: Convert to fraction form
    18,302.70/25,257.72 = 9,919.20/x
  3. Step 3: Cross multiply
    18,302.70x = 25,257.72 × 9,919.20
  4. Step 4: Simplify right side
    18,302.70x = 250,536,376.22
  5. Step 5: Solve for x
    x = 250,536,376.22/18,302.70
  6. Step 6: Final answer
    x = 13,688.49

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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.