Home / 20,851.75-28,775.42-11,420.65

Finding the Fourth Proportional to 20,851.75, 28,775.42 and 11,420.65

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Solution

The fourth proportional to 20,851.75, 28,775.42 and 11,420.65 is: 15,760.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,851.75 : 28,775.42 = 11,420.65 : x
  2. Step 2: Convert to fraction form
    20,851.75/28,775.42 = 11,420.65/x
  3. Step 3: Cross multiply
    20,851.75x = 28,775.42 × 11,420.65
  4. Step 4: Simplify right side
    20,851.75x = 328,634,000.42
  5. Step 5: Solve for x
    x = 328,634,000.42/20,851.75
  6. Step 6: Final answer
    x = 15,760.50

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.