Home / 21,022.21-29,012.70-15,707.80

Finding the Fourth Proportional to 21,022.21, 29,012.70 and 15,707.80

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Solution

The fourth proportional to 21,022.21, 29,012.70 and 15,707.80 is: 21,678.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,022.21 : 29,012.70 = 15,707.80 : x
  2. Step 2: Convert to fraction form
    21,022.21/29,012.70 = 15,707.80/x
  3. Step 3: Cross multiply
    21,022.21x = 29,012.70 × 15,707.80
  4. Step 4: Simplify right side
    21,022.21x = 455,725,689.06
  5. Step 5: Solve for x
    x = 455,725,689.06/21,022.21
  6. Step 6: Final answer
    x = 21,678.30

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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.