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Finding the Fourth Proportional to 38,686.80, 58,089.60 and 21,190.80

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Solution

The fourth proportional to 38,686.80, 58,089.60 and 21,190.80 is: 31,818.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,686.80 : 58,089.60 = 21,190.80 : x
  2. Step 2: Convert to fraction form
    38,686.80/58,089.60 = 21,190.80/x
  3. Step 3: Cross multiply
    38,686.80x = 58,089.60 × 21,190.80
  4. Step 4: Simplify right side
    38,686.80x = 1,230,965,095.68
  5. Step 5: Solve for x
    x = 1,230,965,095.68/38,686.80
  6. Step 6: Final answer
    x = 31,818.74

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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.