Home / 21,129.32-31,725.12-11,787.60

Finding the Fourth Proportional to 21,129.32, 31,725.12 and 11,787.60

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Solution

The fourth proportional to 21,129.32, 31,725.12 and 11,787.60 is: 17,698.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,129.32 : 31,725.12 = 11,787.60 : x
  2. Step 2: Convert to fraction form
    21,129.32/31,725.12 = 11,787.60/x
  3. Step 3: Cross multiply
    21,129.32x = 31,725.12 × 11,787.60
  4. Step 4: Simplify right side
    21,129.32x = 373,963,024.51
  5. Step 5: Solve for x
    x = 373,963,024.51/21,129.32
  6. Step 6: Final answer
    x = 17,698.77

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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.