Home / 13,721.13-18,935.51-8,418.87

Finding the Fourth Proportional to 13,721.13, 18,935.51 and 8,418.87

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Solution

The fourth proportional to 13,721.13, 18,935.51 and 8,418.87 is: 11,618.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,721.13 : 18,935.51 = 8,418.87 : x
  2. Step 2: Convert to fraction form
    13,721.13/18,935.51 = 8,418.87/x
  3. Step 3: Cross multiply
    13,721.13x = 18,935.51 × 8,418.87
  4. Step 4: Simplify right side
    13,721.13x = 159,415,554.98
  5. Step 5: Solve for x
    x = 159,415,554.98/13,721.13
  6. Step 6: Final answer
    x = 11,618.25

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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.