Home / 10,915.86-16,375.65-3,990.30

Finding the Fourth Proportional to 10,915.86, 16,375.65 and 3,990.30

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Solution

The fourth proportional to 10,915.86, 16,375.65 and 3,990.30 is: 5,986.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,915.86 : 16,375.65 = 3,990.30 : x
  2. Step 2: Convert to fraction form
    10,915.86/16,375.65 = 3,990.30/x
  3. Step 3: Cross multiply
    10,915.86x = 16,375.65 × 3,990.30
  4. Step 4: Simplify right side
    10,915.86x = 65,343,756.20
  5. Step 5: Solve for x
    x = 65,343,756.20/10,915.86
  6. Step 6: Final answer
    x = 5,986.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.