Home / 21,821.56-30,113.47-12,389.51

Finding the Fourth Proportional to 21,821.56, 30,113.47 and 12,389.51

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Solution

The fourth proportional to 21,821.56, 30,113.47 and 12,389.51 is: 17,097.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,821.56 : 30,113.47 = 12,389.51 : x
  2. Step 2: Convert to fraction form
    21,821.56/30,113.47 = 12,389.51/x
  3. Step 3: Cross multiply
    21,821.56x = 30,113.47 × 12,389.51
  4. Step 4: Simplify right side
    21,821.56x = 373,091,137.70
  5. Step 5: Solve for x
    x = 373,091,137.70/21,821.56
  6. Step 6: Final answer
    x = 17,097.37

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.