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Finding the Fourth Proportional to 51,235, 70,704.30 and 28,879.80

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Solution

The fourth proportional to 51,235, 70,704.30 and 28,879.80 is: 39,854.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    51,235 : 70,704.30 = 28,879.80 : x
  2. Step 2: Convert to fraction form
    51,235/70,704.30 = 28,879.80/x
  3. Step 3: Cross multiply
    51,235x = 70,704.30 × 28,879.80
  4. Step 4: Simplify right side
    51,235x = 2,041,926,043.14
  5. Step 5: Solve for x
    x = 2,041,926,043.14/51,235
  6. Step 6: Final answer
    x = 39,854.12

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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.