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Finding the Fourth Proportional to 21,674.25, 29,900.39 and 15,390.09

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Solution

The fourth proportional to 21,674.25, 29,900.39 and 15,390.09 is: 21,231.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,674.25 : 29,900.39 = 15,390.09 : x
  2. Step 2: Convert to fraction form
    21,674.25/29,900.39 = 15,390.09/x
  3. Step 3: Cross multiply
    21,674.25x = 29,900.39 × 15,390.09
  4. Step 4: Simplify right side
    21,674.25x = 460,169,616.18
  5. Step 5: Solve for x
    x = 460,169,616.18/21,674.25
  6. Step 6: Final answer
    x = 21,231.17

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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.