Home / 13,388.13-18,475.61-7,420.19

Finding the Fourth Proportional to 13,388.13, 18,475.61 and 7,420.19

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Solution

The fourth proportional to 13,388.13, 18,475.61 and 7,420.19 is: 10,239.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,388.13 : 18,475.61 = 7,420.19 : x
  2. Step 2: Convert to fraction form
    13,388.13/18,475.61 = 7,420.19/x
  3. Step 3: Cross multiply
    13,388.13x = 18,475.61 × 7,420.19
  4. Step 4: Simplify right side
    13,388.13x = 137,092,407.09
  5. Step 5: Solve for x
    x = 137,092,407.09/13,388.13
  6. Step 6: Final answer
    x = 10,239.85

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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.