Home / 31,143.30-42,964.66-21,717.33

Finding the Fourth Proportional to 31,143.30, 42,964.66 and 21,717.33

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Solution

The fourth proportional to 31,143.30, 42,964.66 and 21,717.33 is: 29,960.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,143.30 : 42,964.66 = 21,717.33 : x
  2. Step 2: Convert to fraction form
    31,143.30/42,964.66 = 21,717.33/x
  3. Step 3: Cross multiply
    31,143.30x = 42,964.66 × 21,717.33
  4. Step 4: Simplify right side
    31,143.30x = 933,077,699.56
  5. Step 5: Solve for x
    x = 933,077,699.56/31,143.30
  6. Step 6: Final answer
    x = 29,960.78

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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.