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Finding the Fourth Proportional to 18,817.70, 25,971.81 and 10,858.82

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Solution

The fourth proportional to 18,817.70, 25,971.81 and 10,858.82 is: 14,987.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,817.70 : 25,971.81 = 10,858.82 : x
  2. Step 2: Convert to fraction form
    18,817.70/25,971.81 = 10,858.82/x
  3. Step 3: Cross multiply
    18,817.70x = 25,971.81 × 10,858.82
  4. Step 4: Simplify right side
    18,817.70x = 282,023,209.86
  5. Step 5: Solve for x
    x = 282,023,209.86/18,817.70
  6. Step 6: Final answer
    x = 14,987.12

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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.