Home / 21,053.71-31,603.29-18,728.56

Finding the Fourth Proportional to 21,053.71, 31,603.29 and 18,728.56

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Solution

The fourth proportional to 21,053.71, 31,603.29 and 18,728.56 is: 28,113.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,053.71 : 31,603.29 = 18,728.56 : x
  2. Step 2: Convert to fraction form
    21,053.71/31,603.29 = 18,728.56/x
  3. Step 3: Cross multiply
    21,053.71x = 31,603.29 × 18,728.56
  4. Step 4: Simplify right side
    21,053.71x = 591,884,112.96
  5. Step 5: Solve for x
    x = 591,884,112.96/21,053.71
  6. Step 6: Final answer
    x = 28,113.06

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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.