Home / 21,278.25-31,945.64-18,178.17

Finding the Fourth Proportional to 21,278.25, 31,945.64 and 18,178.17

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Solution

The fourth proportional to 21,278.25, 31,945.64 and 18,178.17 is: 27,291.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,278.25 : 31,945.64 = 18,178.17 : x
  2. Step 2: Convert to fraction form
    21,278.25/31,945.64 = 18,178.17/x
  3. Step 3: Cross multiply
    21,278.25x = 31,945.64 × 18,178.17
  4. Step 4: Simplify right side
    21,278.25x = 580,713,183.79
  5. Step 5: Solve for x
    x = 580,713,183.79/21,278.25
  6. Step 6: Final answer
    x = 27,291.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.