Home / 13,136.22-18,127.98-8,420.51

Finding the Fourth Proportional to 13,136.22, 18,127.98 and 8,420.51

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Solution

The fourth proportional to 13,136.22, 18,127.98 and 8,420.51 is: 11,620.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,136.22 : 18,127.98 = 8,420.51 : x
  2. Step 2: Convert to fraction form
    13,136.22/18,127.98 = 8,420.51/x
  3. Step 3: Cross multiply
    13,136.22x = 18,127.98 × 8,420.51
  4. Step 4: Simplify right side
    13,136.22x = 152,646,836.87
  5. Step 5: Solve for x
    x = 152,646,836.87/13,136.22
  6. Step 6: Final answer
    x = 11,620.30

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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.