Home / 21,379.47-31,989-20,254.38

Finding the Fourth Proportional to 21,379.47, 31,989 and 20,254.38

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Solution

The fourth proportional to 21,379.47, 31,989 and 20,254.38 is: 30,305.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,379.47 : 31,989 = 20,254.38 : x
  2. Step 2: Convert to fraction form
    21,379.47/31,989 = 20,254.38/x
  3. Step 3: Cross multiply
    21,379.47x = 31,989 × 20,254.38
  4. Step 4: Simplify right side
    21,379.47x = 647,917,361.82
  5. Step 5: Solve for x
    x = 647,917,361.82/21,379.47
  6. Step 6: Final answer
    x = 30,305.59

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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.