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Finding the Fourth Proportional to 28,365.65, 42,571.15 and 12,784.49

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Solution

The fourth proportional to 28,365.65, 42,571.15 and 12,784.49 is: 19,186.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,365.65 : 42,571.15 = 12,784.49 : x
  2. Step 2: Convert to fraction form
    28,365.65/42,571.15 = 12,784.49/x
  3. Step 3: Cross multiply
    28,365.65x = 42,571.15 × 12,784.49
  4. Step 4: Simplify right side
    28,365.65x = 544,250,196.65
  5. Step 5: Solve for x
    x = 544,250,196.65/28,365.65
  6. Step 6: Final answer
    x = 19,186.95

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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.