Home / 21,054.06-31,564.32-12,159.30

Finding the Fourth Proportional to 21,054.06, 31,564.32 and 12,159.30

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Solution

The fourth proportional to 21,054.06, 31,564.32 and 12,159.30 is: 18,229.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,054.06 : 31,564.32 = 12,159.30 : x
  2. Step 2: Convert to fraction form
    21,054.06/31,564.32 = 12,159.30/x
  3. Step 3: Cross multiply
    21,054.06x = 31,564.32 × 12,159.30
  4. Step 4: Simplify right side
    21,054.06x = 383,800,036.18
  5. Step 5: Solve for x
    x = 383,800,036.18/21,054.06
  6. Step 6: Final answer
    x = 18,229.26

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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.