Home / 21,821.90-30,114.26-12,390.46

Finding the Fourth Proportional to 21,821.90, 30,114.26 and 12,390.46

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Solution

The fourth proportional to 21,821.90, 30,114.26 and 12,390.46 is: 17,098.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,821.90 : 30,114.26 = 12,390.46 : x
  2. Step 2: Convert to fraction form
    21,821.90/30,114.26 = 12,390.46/x
  3. Step 3: Cross multiply
    21,821.90x = 30,114.26 × 12,390.46
  4. Step 4: Simplify right side
    21,821.90x = 373,129,533.96
  5. Step 5: Solve for x
    x = 373,129,533.96/21,821.90
  6. Step 6: Final answer
    x = 17,098.86

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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.