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Finding the Fourth Proportional to 19,920.72, 29,881.08 and 7,440.24

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Solution

The fourth proportional to 19,920.72, 29,881.08 and 7,440.24 is: 11,160.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,920.72 : 29,881.08 = 7,440.24 : x
  2. Step 2: Convert to fraction form
    19,920.72/29,881.08 = 7,440.24/x
  3. Step 3: Cross multiply
    19,920.72x = 29,881.08 × 7,440.24
  4. Step 4: Simplify right side
    19,920.72x = 222,322,406.66
  5. Step 5: Solve for x
    x = 222,322,406.66/19,920.72
  6. Step 6: Final answer
    x = 11,160.36

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Double scale
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Similar ratio
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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.