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Finding the Fourth Proportional to 38,686.40, 58,040.40 and 18,965.60

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Solution

The fourth proportional to 38,686.40, 58,040.40 and 18,965.60 is: 28,453.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,686.40 : 58,040.40 = 18,965.60 : x
  2. Step 2: Convert to fraction form
    38,686.40/58,040.40 = 18,965.60/x
  3. Step 3: Cross multiply
    38,686.40x = 58,040.40 × 18,965.60
  4. Step 4: Simplify right side
    38,686.40x = 1,100,771,010.24
  5. Step 5: Solve for x
    x = 1,100,771,010.24/38,686.40
  6. Step 6: Final answer
    x = 28,453.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.