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Finding the Fourth Proportional to 15,290.13, 21,100.41 and 8,921.10

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Solution

The fourth proportional to 15,290.13, 21,100.41 and 8,921.10 is: 12,311.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,290.13 : 21,100.41 = 8,921.10 : x
  2. Step 2: Convert to fraction form
    15,290.13/21,100.41 = 8,921.10/x
  3. Step 3: Cross multiply
    15,290.13x = 21,100.41 × 8,921.10
  4. Step 4: Simplify right side
    15,290.13x = 188,238,867.65
  5. Step 5: Solve for x
    x = 188,238,867.65/15,290.13
  6. Step 6: Final answer
    x = 12,311.14

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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.