Home / 15,669.78-21,559.32-13,685.07

Finding the Fourth Proportional to 15,669.78, 21,559.32 and 13,685.07

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Solution

The fourth proportional to 15,669.78, 21,559.32 and 13,685.07 is: 18,828.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,669.78 : 21,559.32 = 13,685.07 : x
  2. Step 2: Convert to fraction form
    15,669.78/21,559.32 = 13,685.07/x
  3. Step 3: Cross multiply
    15,669.78x = 21,559.32 × 13,685.07
  4. Step 4: Simplify right side
    15,669.78x = 295,040,803.35
  5. Step 5: Solve for x
    x = 295,040,803.35/15,669.78
  6. Step 6: Final answer
    x = 18,828.65

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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.