Home / 21,135.83-31,680.86-13,745.59

Finding the Fourth Proportional to 21,135.83, 31,680.86 and 13,745.59

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Solution

The fourth proportional to 21,135.83, 31,680.86 and 13,745.59 is: 20,603.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,135.83 : 31,680.86 = 13,745.59 : x
  2. Step 2: Convert to fraction form
    21,135.83/31,680.86 = 13,745.59/x
  3. Step 3: Cross multiply
    21,135.83x = 31,680.86 × 13,745.59
  4. Step 4: Simplify right side
    21,135.83x = 435,471,964.48
  5. Step 5: Solve for x
    x = 435,471,964.48/21,135.83
  6. Step 6: Final answer
    x = 20,603.50

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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.