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Finding the Fourth Proportional to 28,399.36, 42,618.48 and 13,618.48

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Solution

The fourth proportional to 28,399.36, 42,618.48 and 13,618.48 is: 20,437.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,399.36 : 42,618.48 = 13,618.48 : x
  2. Step 2: Convert to fraction form
    28,399.36/42,618.48 = 13,618.48/x
  3. Step 3: Cross multiply
    28,399.36x = 42,618.48 × 13,618.48
  4. Step 4: Simplify right side
    28,399.36x = 580,398,917.51
  5. Step 5: Solve for x
    x = 580,398,917.51/28,399.36
  6. Step 6: Final answer
    x = 20,437.04

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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.