Home / 21,331.60-31,970.40-8,166.40

Finding the Fourth Proportional to 21,331.60, 31,970.40 and 8,166.40

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Solution

The fourth proportional to 21,331.60, 31,970.40 and 8,166.40 is: 12,239.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,331.60 : 31,970.40 = 8,166.40 : x
  2. Step 2: Convert to fraction form
    21,331.60/31,970.40 = 8,166.40/x
  3. Step 3: Cross multiply
    21,331.60x = 31,970.40 × 8,166.40
  4. Step 4: Simplify right side
    21,331.60x = 261,083,074.56
  5. Step 5: Solve for x
    x = 261,083,074.56/21,331.60
  6. Step 6: Final answer
    x = 12,239.26

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.