Home / 13,611.36-20,420.28-5,291.58

Finding the Fourth Proportional to 13,611.36, 20,420.28 and 5,291.58

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Solution

The fourth proportional to 13,611.36, 20,420.28 and 5,291.58 is: 7,938.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,611.36 : 20,420.28 = 5,291.58 : x
  2. Step 2: Convert to fraction form
    13,611.36/20,420.28 = 5,291.58/x
  3. Step 3: Cross multiply
    13,611.36x = 20,420.28 × 5,291.58
  4. Step 4: Simplify right side
    13,611.36x = 108,055,545.24
  5. Step 5: Solve for x
    x = 108,055,545.24/13,611.36
  6. Step 6: Final answer
    x = 7,938.63

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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.