Home / 20,830.32-31,247.55-7,680.99

Finding the Fourth Proportional to 20,830.32, 31,247.55 and 7,680.99

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Solution

The fourth proportional to 20,830.32, 31,247.55 and 7,680.99 is: 11,522.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,830.32 : 31,247.55 = 7,680.99 : x
  2. Step 2: Convert to fraction form
    20,830.32/31,247.55 = 7,680.99/x
  3. Step 3: Cross multiply
    20,830.32x = 31,247.55 × 7,680.99
  4. Step 4: Simplify right side
    20,830.32x = 240,012,119.07
  5. Step 5: Solve for x
    x = 240,012,119.07/20,830.32
  6. Step 6: Final answer
    x = 11,522.25

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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.