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Finding the Fourth Proportional to 18,945.55, 28,418.47 and 8,412.74

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Solution

The fourth proportional to 18,945.55, 28,418.47 and 8,412.74 is: 12,619.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,945.55 : 28,418.47 = 8,412.74 : x
  2. Step 2: Convert to fraction form
    18,945.55/28,418.47 = 8,412.74/x
  3. Step 3: Cross multiply
    18,945.55x = 28,418.47 × 8,412.74
  4. Step 4: Simplify right side
    18,945.55x = 239,077,199.31
  5. Step 5: Solve for x
    x = 239,077,199.31/18,945.55
  6. Step 6: Final answer
    x = 12,619.17

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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.