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Finding the Fourth Proportional to 28,191.37, 42,287 and 12,392.63

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Solution

The fourth proportional to 28,191.37, 42,287 and 12,392.63 is: 18,588.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,191.37 : 42,287 = 12,392.63 : x
  2. Step 2: Convert to fraction form
    28,191.37/42,287 = 12,392.63/x
  3. Step 3: Cross multiply
    28,191.37x = 42,287 × 12,392.63
  4. Step 4: Simplify right side
    28,191.37x = 524,046,933.38
  5. Step 5: Solve for x
    x = 524,046,933.38/28,191.37
  6. Step 6: Final answer
    x = 18,588.91

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1.5x scale

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.