Home / 21,220.57-31,830.90-5,638.15

Finding the Fourth Proportional to 21,220.57, 31,830.90 and 5,638.15

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Solution

The fourth proportional to 21,220.57, 31,830.90 and 5,638.15 is: 8,457.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,220.57 : 31,830.90 = 5,638.15 : x
  2. Step 2: Convert to fraction form
    21,220.57/31,830.90 = 5,638.15/x
  3. Step 3: Cross multiply
    21,220.57x = 31,830.90 × 5,638.15
  4. Step 4: Simplify right side
    21,220.57x = 179,467,388.84
  5. Step 5: Solve for x
    x = 179,467,388.84/21,220.57
  6. Step 6: Final answer
    x = 8,457.24

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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.