Home / 20,830.70-31,237.65-7,680.15

Finding the Fourth Proportional to 20,830.70, 31,237.65 and 7,680.15

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Solution

The fourth proportional to 20,830.70, 31,237.65 and 7,680.15 is: 11,517.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,830.70 : 31,237.65 = 7,680.15 : x
  2. Step 2: Convert to fraction form
    20,830.70/31,237.65 = 7,680.15/x
  3. Step 3: Cross multiply
    20,830.70x = 31,237.65 × 7,680.15
  4. Step 4: Simplify right side
    20,830.70x = 239,909,837.65
  5. Step 5: Solve for x
    x = 239,909,837.65/20,830.70
  6. Step 6: Final answer
    x = 11,517.13

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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.