Home / 21,127.81-29,147.83-12,170.53

Finding the Fourth Proportional to 21,127.81, 29,147.83 and 12,170.53

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Solution

The fourth proportional to 21,127.81, 29,147.83 and 12,170.53 is: 16,790.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,127.81 : 29,147.83 = 12,170.53 : x
  2. Step 2: Convert to fraction form
    21,127.81/29,147.83 = 12,170.53/x
  3. Step 3: Cross multiply
    21,127.81x = 29,147.83 × 12,170.53
  4. Step 4: Simplify right side
    21,127.81x = 354,744,539.45
  5. Step 5: Solve for x
    x = 354,744,539.45/21,127.81
  6. Step 6: Final answer
    x = 16,790.41

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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.