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Finding the Fourth Proportional to 13,502.70, 20,205.45 and 9,128.70

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Solution

The fourth proportional to 13,502.70, 20,205.45 and 9,128.70 is: 13,660.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,502.70 : 20,205.45 = 9,128.70 : x
  2. Step 2: Convert to fraction form
    13,502.70/20,205.45 = 9,128.70/x
  3. Step 3: Cross multiply
    13,502.70x = 20,205.45 × 9,128.70
  4. Step 4: Simplify right side
    13,502.70x = 184,449,491.42
  5. Step 5: Solve for x
    x = 184,449,491.42/13,502.70
  6. Step 6: Final answer
    x = 13,660.19

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.