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Finding the Fourth Proportional to 28,980, 39,994.40 and 16,404.80

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Solution

The fourth proportional to 28,980, 39,994.40 and 16,404.80 is: 22,639.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,980 : 39,994.40 = 16,404.80 : x
  2. Step 2: Convert to fraction form
    28,980/39,994.40 = 16,404.80/x
  3. Step 3: Cross multiply
    28,980x = 39,994.40 × 16,404.80
  4. Step 4: Simplify right side
    28,980x = 656,100,133.12
  5. Step 5: Solve for x
    x = 656,100,133.12/28,980
  6. Step 6: Final answer
    x = 22,639.76

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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.