Home / 20,986.60-31,479.90-7,135.60

Finding the Fourth Proportional to 20,986.60, 31,479.90 and 7,135.60

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Solution

The fourth proportional to 20,986.60, 31,479.90 and 7,135.60 is: 10,703.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,986.60 : 31,479.90 = 7,135.60 : x
  2. Step 2: Convert to fraction form
    20,986.60/31,479.90 = 7,135.60/x
  3. Step 3: Cross multiply
    20,986.60x = 31,479.90 × 7,135.60
  4. Step 4: Simplify right side
    20,986.60x = 224,627,974.44
  5. Step 5: Solve for x
    x = 224,627,974.44/20,986.60
  6. Step 6: Final answer
    x = 10,703.40

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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.