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Finding the Fourth Proportional to 13,219.80, 19,824.90 and 6,643.80

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Solution

The fourth proportional to 13,219.80, 19,824.90 and 6,643.80 is: 9,963.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,219.80 : 19,824.90 = 6,643.80 : x
  2. Step 2: Convert to fraction form
    13,219.80/19,824.90 = 6,643.80/x
  3. Step 3: Cross multiply
    13,219.80x = 19,824.90 × 6,643.80
  4. Step 4: Simplify right side
    13,219.80x = 131,712,670.62
  5. Step 5: Solve for x
    x = 131,712,670.62/13,219.80
  6. Step 6: Final answer
    x = 9,963.29

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1.5x scale

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.