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Finding the Fourth Proportional to 18,781.70, 25,918.80 and 10,283.90

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Solution

The fourth proportional to 18,781.70, 25,918.80 and 10,283.90 is: 14,191.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,781.70 : 25,918.80 = 10,283.90 : x
  2. Step 2: Convert to fraction form
    18,781.70/25,918.80 = 10,283.90/x
  3. Step 3: Cross multiply
    18,781.70x = 25,918.80 × 10,283.90
  4. Step 4: Simplify right side
    18,781.70x = 266,546,347.32
  5. Step 5: Solve for x
    x = 266,546,347.32/18,781.70
  6. Step 6: Final answer
    x = 14,191.81

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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.