Home / 13,429.40-20,141.70-8,490.20

Finding the Fourth Proportional to 13,429.40, 20,141.70 and 8,490.20

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Solution

The fourth proportional to 13,429.40, 20,141.70 and 8,490.20 is: 12,733.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,429.40 : 20,141.70 = 8,490.20 : x
  2. Step 2: Convert to fraction form
    13,429.40/20,141.70 = 8,490.20/x
  3. Step 3: Cross multiply
    13,429.40x = 20,141.70 × 8,490.20
  4. Step 4: Simplify right side
    13,429.40x = 171,007,061.34
  5. Step 5: Solve for x
    x = 171,007,061.34/13,429.40
  6. Step 6: Final answer
    x = 12,733.78

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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.