Home / 21,307.16-31,880.38-12,726.79

Finding the Fourth Proportional to 21,307.16, 31,880.38 and 12,726.79

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Solution

The fourth proportional to 21,307.16, 31,880.38 and 12,726.79 is: 19,042.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,307.16 : 31,880.38 = 12,726.79 : x
  2. Step 2: Convert to fraction form
    21,307.16/31,880.38 = 12,726.79/x
  3. Step 3: Cross multiply
    21,307.16x = 31,880.38 × 12,726.79
  4. Step 4: Simplify right side
    21,307.16x = 405,734,901.38
  5. Step 5: Solve for x
    x = 405,734,901.38/21,307.16
  6. Step 6: Final answer
    x = 19,042.19

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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.