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Finding the Fourth Proportional to 19,809.78, 29,708.39 and 6,479.69

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Solution

The fourth proportional to 19,809.78, 29,708.39 and 6,479.69 is: 9,717.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,809.78 : 29,708.39 = 6,479.69 : x
  2. Step 2: Convert to fraction form
    19,809.78/29,708.39 = 6,479.69/x
  3. Step 3: Cross multiply
    19,809.78x = 29,708.39 × 6,479.69
  4. Step 4: Simplify right side
    19,809.78x = 192,501,199.47
  5. Step 5: Solve for x
    x = 192,501,199.47/19,809.78
  6. Step 6: Final answer
    x = 9,717.48

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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.