Home / 13,420.30-18,526.30-8,391.90

Finding the Fourth Proportional to 13,420.30, 18,526.30 and 8,391.90

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Solution

The fourth proportional to 13,420.30, 18,526.30 and 8,391.90 is: 11,584.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,420.30 : 18,526.30 = 8,391.90 : x
  2. Step 2: Convert to fraction form
    13,420.30/18,526.30 = 8,391.90/x
  3. Step 3: Cross multiply
    13,420.30x = 18,526.30 × 8,391.90
  4. Step 4: Simplify right side
    13,420.30x = 155,470,856.97
  5. Step 5: Solve for x
    x = 155,470,856.97/13,420.30
  6. Step 6: Final answer
    x = 11,584.75

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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.