Home / 15,136.85-20,886.80-8,421.62

Finding the Fourth Proportional to 15,136.85, 20,886.80 and 8,421.62

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Solution

The fourth proportional to 15,136.85, 20,886.80 and 8,421.62 is: 11,620.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,136.85 : 20,886.80 = 8,421.62 : x
  2. Step 2: Convert to fraction form
    15,136.85/20,886.80 = 8,421.62/x
  3. Step 3: Cross multiply
    15,136.85x = 20,886.80 × 8,421.62
  4. Step 4: Simplify right side
    15,136.85x = 175,900,546.07
  5. Step 5: Solve for x
    x = 175,900,546.07/15,136.85
  6. Step 6: Final answer
    x = 11,620.69

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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.