Home / 21,129.76-31,664.40-11,876.32

Finding the Fourth Proportional to 21,129.76, 31,664.40 and 11,876.32

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Solution

The fourth proportional to 21,129.76, 31,664.40 and 11,876.32 is: 17,797.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,129.76 : 31,664.40 = 11,876.32 : x
  2. Step 2: Convert to fraction form
    21,129.76/31,664.40 = 11,876.32/x
  3. Step 3: Cross multiply
    21,129.76x = 31,664.40 × 11,876.32
  4. Step 4: Simplify right side
    21,129.76x = 376,056,547.01
  5. Step 5: Solve for x
    x = 376,056,547.01/21,129.76
  6. Step 6: Final answer
    x = 17,797.48

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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.