Home / 31,379.33-43,279.48-21,315.53

Finding the Fourth Proportional to 31,379.33, 43,279.48 and 21,315.53

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Solution

The fourth proportional to 31,379.33, 43,279.48 and 21,315.53 is: 29,399.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,379.33 : 43,279.48 = 21,315.53 : x
  2. Step 2: Convert to fraction form
    31,379.33/43,279.48 = 21,315.53/x
  3. Step 3: Cross multiply
    31,379.33x = 43,279.48 × 21,315.53
  4. Step 4: Simplify right side
    31,379.33x = 922,525,054.32
  5. Step 5: Solve for x
    x = 922,525,054.32/31,379.33
  6. Step 6: Final answer
    x = 29,399.13

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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.