Home / 20,851.25-28,774.73-11,420.15

Finding the Fourth Proportional to 20,851.25, 28,774.73 and 11,420.15

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Solution

The fourth proportional to 20,851.25, 28,774.73 and 11,420.15 is: 15,759.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,851.25 : 28,774.73 = 11,420.15 : x
  2. Step 2: Convert to fraction form
    20,851.25/28,774.73 = 11,420.15/x
  3. Step 3: Cross multiply
    20,851.25x = 28,774.73 × 11,420.15
  4. Step 4: Simplify right side
    20,851.25x = 328,611,675.71
  5. Step 5: Solve for x
    x = 328,611,675.71/20,851.25
  6. Step 6: Final answer
    x = 15,759.81

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1.5x scale

Why These Related Problems?

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