Home / 15,136.76-20,886.85-8,421.91

Finding the Fourth Proportional to 15,136.76, 20,886.85 and 8,421.91

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Solution

The fourth proportional to 15,136.76, 20,886.85 and 8,421.91 is: 11,621.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,136.76 : 20,886.85 = 8,421.91 : x
  2. Step 2: Convert to fraction form
    15,136.76/20,886.85 = 8,421.91/x
  3. Step 3: Cross multiply
    15,136.76x = 20,886.85 × 8,421.91
  4. Step 4: Simplify right side
    15,136.76x = 175,907,170.88
  5. Step 5: Solve for x
    x = 175,907,170.88/15,136.76
  6. Step 6: Final answer
    x = 11,621.19

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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.