Home / 21,858.74-30,170.10-12,788.31

Finding the Fourth Proportional to 21,858.74, 30,170.10 and 12,788.31

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Solution

The fourth proportional to 21,858.74, 30,170.10 and 12,788.31 is: 17,650.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,858.74 : 30,170.10 = 12,788.31 : x
  2. Step 2: Convert to fraction form
    21,858.74/30,170.10 = 12,788.31/x
  3. Step 3: Cross multiply
    21,858.74x = 30,170.10 × 12,788.31
  4. Step 4: Simplify right side
    21,858.74x = 385,824,591.53
  5. Step 5: Solve for x
    x = 385,824,591.53/21,858.74
  6. Step 6: Final answer
    x = 17,650.81

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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.