Home / 21,621.93-29,833.70-13,128.53

Finding the Fourth Proportional to 21,621.93, 29,833.70 and 13,128.53

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Solution

The fourth proportional to 21,621.93, 29,833.70 and 13,128.53 is: 18,114.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,621.93 : 29,833.70 = 13,128.53 : x
  2. Step 2: Convert to fraction form
    21,621.93/29,833.70 = 13,128.53/x
  3. Step 3: Cross multiply
    21,621.93x = 29,833.70 × 13,128.53
  4. Step 4: Simplify right side
    21,621.93x = 391,672,410.65
  5. Step 5: Solve for x
    x = 391,672,410.65/21,621.93
  6. Step 6: Final answer
    x = 18,114.59

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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.