Home / 15,136.72-20,888.78-8,422.63

Finding the Fourth Proportional to 15,136.72, 20,888.78 and 8,422.63

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Solution

The fourth proportional to 15,136.72, 20,888.78 and 8,422.63 is: 11,623.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,136.72 : 20,888.78 = 8,422.63 : x
  2. Step 2: Convert to fraction form
    15,136.72/20,888.78 = 8,422.63/x
  3. Step 3: Cross multiply
    15,136.72x = 20,888.78 × 8,422.63
  4. Step 4: Simplify right side
    15,136.72x = 175,938,465.09
  5. Step 5: Solve for x
    x = 175,938,465.09/15,136.72
  6. Step 6: Final answer
    x = 11,623.29

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Double scale
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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.