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Finding the Fourth Proportional to 19,760.88, 29,641.34 and 7,920

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Solution

The fourth proportional to 19,760.88, 29,641.34 and 7,920 is: 11,880.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,760.88 : 29,641.34 = 7,920 : x
  2. Step 2: Convert to fraction form
    19,760.88/29,641.34 = 7,920/x
  3. Step 3: Cross multiply
    19,760.88x = 29,641.34 × 7,920
  4. Step 4: Simplify right side
    19,760.88x = 234,759,412.80
  5. Step 5: Solve for x
    x = 234,759,412.80/19,760.88
  6. Step 6: Final answer
    x = 11,880.01

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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.