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Finding the Fourth Proportional to 18,961.98, 26,155.35 and 11,509.98

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Solution

The fourth proportional to 18,961.98, 26,155.35 and 11,509.98 is: 15,876.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,961.98 : 26,155.35 = 11,509.98 : x
  2. Step 2: Convert to fraction form
    18,961.98/26,155.35 = 11,509.98/x
  3. Step 3: Cross multiply
    18,961.98x = 26,155.35 × 11,509.98
  4. Step 4: Simplify right side
    18,961.98x = 301,047,555.39
  5. Step 5: Solve for x
    x = 301,047,555.39/18,961.98
  6. Step 6: Final answer
    x = 15,876.38

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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.