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Finding the Fourth Proportional to 13,859.70, 19,139.85 and 11,858.55

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Solution

The fourth proportional to 13,859.70, 19,139.85 and 11,858.55 is: 16,376.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,859.70 : 19,139.85 = 11,858.55 : x
  2. Step 2: Convert to fraction form
    13,859.70/19,139.85 = 11,858.55/x
  3. Step 3: Cross multiply
    13,859.70x = 19,139.85 × 11,858.55
  4. Step 4: Simplify right side
    13,859.70x = 226,970,868.22
  5. Step 5: Solve for x
    x = 226,970,868.22/13,859.70
  6. Step 6: Final answer
    x = 16,376.32

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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.