Home / 21,879.06-30,192.40-12,319.44

Finding the Fourth Proportional to 21,879.06, 30,192.40 and 12,319.44

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Solution

The fourth proportional to 21,879.06, 30,192.40 and 12,319.44 is: 17,000.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,879.06 : 30,192.40 = 12,319.44 : x
  2. Step 2: Convert to fraction form
    21,879.06/30,192.40 = 12,319.44/x
  3. Step 3: Cross multiply
    21,879.06x = 30,192.40 × 12,319.44
  4. Step 4: Simplify right side
    21,879.06x = 371,953,460.26
  5. Step 5: Solve for x
    x = 371,953,460.26/21,879.06
  6. Step 6: Final answer
    x = 17,000.43

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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.