Home / 20,880.38-31,312.80-8,396.20

Finding the Fourth Proportional to 20,880.38, 31,312.80 and 8,396.20

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Solution

The fourth proportional to 20,880.38, 31,312.80 and 8,396.20 is: 12,591.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,880.38 : 31,312.80 = 8,396.20 : x
  2. Step 2: Convert to fraction form
    20,880.38/31,312.80 = 8,396.20/x
  3. Step 3: Cross multiply
    20,880.38x = 31,312.80 × 8,396.20
  4. Step 4: Simplify right side
    20,880.38x = 262,908,531.36
  5. Step 5: Solve for x
    x = 262,908,531.36/20,880.38
  6. Step 6: Final answer
    x = 12,591.18

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1.5x scale

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.