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Finding the Fourth Proportional to 19,916.74, 30,008.09 and 18,019.30

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Solution

The fourth proportional to 19,916.74, 30,008.09 and 18,019.30 is: 27,149.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,916.74 : 30,008.09 = 18,019.30 : x
  2. Step 2: Convert to fraction form
    19,916.74/30,008.09 = 18,019.30/x
  3. Step 3: Cross multiply
    19,916.74x = 30,008.09 × 18,019.30
  4. Step 4: Simplify right side
    19,916.74x = 540,724,776.14
  5. Step 5: Solve for x
    x = 540,724,776.14/19,916.74
  6. Step 6: Final answer
    x = 27,149.26

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.