Home / 21,879.67-30,191.45-12,319.31

Finding the Fourth Proportional to 21,879.67, 30,191.45 and 12,319.31

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Solution

The fourth proportional to 21,879.67, 30,191.45 and 12,319.31 is: 16,999.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,879.67 : 30,191.45 = 12,319.31 : x
  2. Step 2: Convert to fraction form
    21,879.67/30,191.45 = 12,319.31/x
  3. Step 3: Cross multiply
    21,879.67x = 30,191.45 × 12,319.31
  4. Step 4: Simplify right side
    21,879.67x = 371,937,756.96
  5. Step 5: Solve for x
    x = 371,937,756.96/21,879.67
  6. Step 6: Final answer
    x = 16,999.24

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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.