Home / 21,208.60-31,812.90-8,729.20

Finding the Fourth Proportional to 21,208.60, 31,812.90 and 8,729.20

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Solution

The fourth proportional to 21,208.60, 31,812.90 and 8,729.20 is: 13,093.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,208.60 : 31,812.90 = 8,729.20 : x
  2. Step 2: Convert to fraction form
    21,208.60/31,812.90 = 8,729.20/x
  3. Step 3: Cross multiply
    21,208.60x = 31,812.90 × 8,729.20
  4. Step 4: Simplify right side
    21,208.60x = 277,701,166.68
  5. Step 5: Solve for x
    x = 277,701,166.68/21,208.60
  6. Step 6: Final answer
    x = 13,093.80

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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.