Home / 13,812.10-20,720.85-5,490.70

Finding the Fourth Proportional to 13,812.10, 20,720.85 and 5,490.70

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Solution

The fourth proportional to 13,812.10, 20,720.85 and 5,490.70 is: 8,237.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,812.10 : 20,720.85 = 5,490.70 : x
  2. Step 2: Convert to fraction form
    13,812.10/20,720.85 = 5,490.70/x
  3. Step 3: Cross multiply
    13,812.10x = 20,720.85 × 5,490.70
  4. Step 4: Simplify right side
    13,812.10x = 113,771,971.10
  5. Step 5: Solve for x
    x = 113,771,971.10/13,812.10
  6. Step 6: Final answer
    x = 8,237.12

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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.