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Finding the Fourth Proportional to 13,578.48, 18,739.08 and 7,612.09

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Solution

The fourth proportional to 13,578.48, 18,739.08 and 7,612.09 is: 10,505.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,578.48 : 18,739.08 = 7,612.09 : x
  2. Step 2: Convert to fraction form
    13,578.48/18,739.08 = 7,612.09/x
  3. Step 3: Cross multiply
    13,578.48x = 18,739.08 × 7,612.09
  4. Step 4: Simplify right side
    13,578.48x = 142,643,516.63
  5. Step 5: Solve for x
    x = 142,643,516.63/13,578.48
  6. Step 6: Final answer
    x = 10,505.12

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.