Home / 21,211.82-31,787.64-15,621.32

Finding the Fourth Proportional to 21,211.82, 31,787.64 and 15,621.32

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Solution

The fourth proportional to 21,211.82, 31,787.64 and 15,621.32 is: 23,409.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,211.82 : 31,787.64 = 15,621.32 : x
  2. Step 2: Convert to fraction form
    21,211.82/31,787.64 = 15,621.32/x
  3. Step 3: Cross multiply
    21,211.82x = 31,787.64 × 15,621.32
  4. Step 4: Simplify right side
    21,211.82x = 496,564,896.48
  5. Step 5: Solve for x
    x = 496,564,896.48/21,211.82
  6. Step 6: Final answer
    x = 23,409.82

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.