Home / 15,853.85-21,857.57-13,639.51

Finding the Fourth Proportional to 15,853.85, 21,857.57 and 13,639.51

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Solution

The fourth proportional to 15,853.85, 21,857.57 and 13,639.51 is: 18,804.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,853.85 : 21,857.57 = 13,639.51 : x
  2. Step 2: Convert to fraction form
    15,853.85/21,857.57 = 13,639.51/x
  3. Step 3: Cross multiply
    15,853.85x = 21,857.57 × 13,639.51
  4. Step 4: Simplify right side
    15,853.85x = 298,126,476.39
  5. Step 5: Solve for x
    x = 298,126,476.39/15,853.85
  6. Step 6: Final answer
    x = 18,804.67

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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.