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Finding the Fourth Proportional to 18,688.70, 25,790.03 and 10,305.20

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Solution

The fourth proportional to 18,688.70, 25,790.03 and 10,305.20 is: 14,220.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,688.70 : 25,790.03 = 10,305.20 : x
  2. Step 2: Convert to fraction form
    18,688.70/25,790.03 = 10,305.20/x
  3. Step 3: Cross multiply
    18,688.70x = 25,790.03 × 10,305.20
  4. Step 4: Simplify right side
    18,688.70x = 265,771,468.75
  5. Step 5: Solve for x
    x = 265,771,468.75/18,688.70
  6. Step 6: Final answer
    x = 14,220.97

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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.