Home / 15,686.25-21,506.67-15,405.58

Finding the Fourth Proportional to 15,686.25, 21,506.67 and 15,405.58

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Solution

The fourth proportional to 15,686.25, 21,506.67 and 15,405.58 is: 21,121.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,686.25 : 21,506.67 = 15,405.58 : x
  2. Step 2: Convert to fraction form
    15,686.25/21,506.67 = 15,405.58/x
  3. Step 3: Cross multiply
    15,686.25x = 21,506.67 × 15,405.58
  4. Step 4: Simplify right side
    15,686.25x = 331,322,725.22
  5. Step 5: Solve for x
    x = 331,322,725.22/15,686.25
  6. Step 6: Final answer
    x = 21,121.86

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.