Home / 15,135.76-20,885.47-8,420.91

Finding the Fourth Proportional to 15,135.76, 20,885.47 and 8,420.91

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Solution

The fourth proportional to 15,135.76, 20,885.47 and 8,420.91 is: 11,619.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,135.76 : 20,885.47 = 8,420.91 : x
  2. Step 2: Convert to fraction form
    15,135.76/20,885.47 = 8,420.91/x
  3. Step 3: Cross multiply
    15,135.76x = 20,885.47 × 8,420.91
  4. Step 4: Simplify right side
    15,135.76x = 175,874,704.97
  5. Step 5: Solve for x
    x = 175,874,704.97/15,135.76
  6. Step 6: Final answer
    x = 11,619.81

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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.