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Finding the Fourth Proportional to 20,792, 31,188.48 and 8,480

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Solution

The fourth proportional to 20,792, 31,188.48 and 8,480 is: 12,720.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,792 : 31,188.48 = 8,480 : x
  2. Step 2: Convert to fraction form
    20,792/31,188.48 = 8,480/x
  3. Step 3: Cross multiply
    20,792x = 31,188.48 × 8,480
  4. Step 4: Simplify right side
    20,792x = 264,478,310.40
  5. Step 5: Solve for x
    x = 264,478,310.40/20,792
  6. Step 6: Final answer
    x = 12,720.20

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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.