Home / 20,899.72-31,361.84-7,761.20

Finding the Fourth Proportional to 20,899.72, 31,361.84 and 7,761.20

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Solution

The fourth proportional to 20,899.72, 31,361.84 and 7,761.20 is: 11,646.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,899.72 : 31,361.84 = 7,761.20 : x
  2. Step 2: Convert to fraction form
    20,899.72/31,361.84 = 7,761.20/x
  3. Step 3: Cross multiply
    20,899.72x = 31,361.84 × 7,761.20
  4. Step 4: Simplify right side
    20,899.72x = 243,405,512.61
  5. Step 5: Solve for x
    x = 243,405,512.61/20,899.72
  6. Step 6: Final answer
    x = 11,646.35

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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.