Home / 20,910.90-31,366.53-5,328.51

Finding the Fourth Proportional to 20,910.90, 31,366.53 and 5,328.51

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Solution

The fourth proportional to 20,910.90, 31,366.53 and 5,328.51 is: 7,992.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,910.90 : 31,366.53 = 5,328.51 : x
  2. Step 2: Convert to fraction form
    20,910.90/31,366.53 = 5,328.51/x
  3. Step 3: Cross multiply
    20,910.90x = 31,366.53 × 5,328.51
  4. Step 4: Simplify right side
    20,910.90x = 167,136,868.77
  5. Step 5: Solve for x
    x = 167,136,868.77/20,910.90
  6. Step 6: Final answer
    x = 7,992.81

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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.