Home / 21,121.98-29,150.55-15,807.48

Finding the Fourth Proportional to 21,121.98, 29,150.55 and 15,807.48

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Solution

The fourth proportional to 21,121.98, 29,150.55 and 15,807.48 is: 21,815.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,121.98 : 29,150.55 = 15,807.48 : x
  2. Step 2: Convert to fraction form
    21,121.98/29,150.55 = 15,807.48/x
  3. Step 3: Cross multiply
    21,121.98x = 29,150.55 × 15,807.48
  4. Step 4: Simplify right side
    21,121.98x = 460,796,736.11
  5. Step 5: Solve for x
    x = 460,796,736.11/21,121.98
  6. Step 6: Final answer
    x = 21,815.98

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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.