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Finding the Fourth Proportional to 15,794.39, 21,795.28 and 8,720.97

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Solution

The fourth proportional to 15,794.39, 21,795.28 and 8,720.97 is: 12,034.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,794.39 : 21,795.28 = 8,720.97 : x
  2. Step 2: Convert to fraction form
    15,794.39/21,795.28 = 8,720.97/x
  3. Step 3: Cross multiply
    15,794.39x = 21,795.28 × 8,720.97
  4. Step 4: Simplify right side
    15,794.39x = 190,075,879.49
  5. Step 5: Solve for x
    x = 190,075,879.49/15,794.39
  6. Step 6: Final answer
    x = 12,034.39

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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.