Home / 30,579.81-42,161.09-19,805.66

Finding the Fourth Proportional to 30,579.81, 42,161.09 and 19,805.66

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Solution

The fourth proportional to 30,579.81, 42,161.09 and 19,805.66 is: 27,306.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,579.81 : 42,161.09 = 19,805.66 : x
  2. Step 2: Convert to fraction form
    30,579.81/42,161.09 = 19,805.66/x
  3. Step 3: Cross multiply
    30,579.81x = 42,161.09 × 19,805.66
  4. Step 4: Simplify right side
    30,579.81x = 835,027,903.94
  5. Step 5: Solve for x
    x = 835,027,903.94/30,579.81
  6. Step 6: Final answer
    x = 27,306.51

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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.