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Finding the Fourth Proportional to 15,479.13, 21,369.06 and 9,819.66

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Solution

The fourth proportional to 15,479.13, 21,369.06 and 9,819.66 is: 13,556.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,479.13 : 21,369.06 = 9,819.66 : x
  2. Step 2: Convert to fraction form
    15,479.13/21,369.06 = 9,819.66/x
  3. Step 3: Cross multiply
    15,479.13x = 21,369.06 × 9,819.66
  4. Step 4: Simplify right side
    15,479.13x = 209,836,903.72
  5. Step 5: Solve for x
    x = 209,836,903.72/15,479.13
  6. Step 6: Final answer
    x = 13,556.12

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.