Home / 20,802.72-31,205.16-5,220.48

Finding the Fourth Proportional to 20,802.72, 31,205.16 and 5,220.48

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Solution

The fourth proportional to 20,802.72, 31,205.16 and 5,220.48 is: 7,830.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,802.72 : 31,205.16 = 5,220.48 : x
  2. Step 2: Convert to fraction form
    20,802.72/31,205.16 = 5,220.48/x
  3. Step 3: Cross multiply
    20,802.72x = 31,205.16 × 5,220.48
  4. Step 4: Simplify right side
    20,802.72x = 162,905,913.68
  5. Step 5: Solve for x
    x = 162,905,913.68/20,802.72
  6. Step 6: Final answer
    x = 7,830.99

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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.