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Finding the Fourth Proportional to 30,628.80, 45,986.40 and 18,964.80

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Solution

The fourth proportional to 30,628.80, 45,986.40 and 18,964.80 is: 28,473.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,628.80 : 45,986.40 = 18,964.80 : x
  2. Step 2: Convert to fraction form
    30,628.80/45,986.40 = 18,964.80/x
  3. Step 3: Cross multiply
    30,628.80x = 45,986.40 × 18,964.80
  4. Step 4: Simplify right side
    30,628.80x = 872,122,878.72
  5. Step 5: Solve for x
    x = 872,122,878.72/30,628.80
  6. Step 6: Final answer
    x = 28,473.95

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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.