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Finding the Fourth Proportional to 19,919.81, 27,429.99 and 19,477.77

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Solution

The fourth proportional to 19,919.81, 27,429.99 and 19,477.77 is: 26,821.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,919.81 : 27,429.99 = 19,477.77 : x
  2. Step 2: Convert to fraction form
    19,919.81/27,429.99 = 19,477.77/x
  3. Step 3: Cross multiply
    19,919.81x = 27,429.99 × 19,477.77
  4. Step 4: Simplify right side
    19,919.81x = 534,274,969.98
  5. Step 5: Solve for x
    x = 534,274,969.98/19,919.81
  6. Step 6: Final answer
    x = 26,821.29

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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.