Home / 30,161.65-45,238.29-21,128.41

Finding the Fourth Proportional to 30,161.65, 45,238.29 and 21,128.41

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Solution

The fourth proportional to 30,161.65, 45,238.29 and 21,128.41 is: 31,689.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,161.65 : 45,238.29 = 21,128.41 : x
  2. Step 2: Convert to fraction form
    30,161.65/45,238.29 = 21,128.41/x
  3. Step 3: Cross multiply
    30,161.65x = 45,238.29 × 21,128.41
  4. Step 4: Simplify right side
    30,161.65x = 955,813,138.82
  5. Step 5: Solve for x
    x = 955,813,138.82/30,161.65
  6. Step 6: Final answer
    x = 31,689.68

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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.