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Finding the Fourth Proportional to 13,505.52, 18,639 and 7,918.32

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Solution

The fourth proportional to 13,505.52, 18,639 and 7,918.32 is: 10,928.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,505.52 : 18,639 = 7,918.32 : x
  2. Step 2: Convert to fraction form
    13,505.52/18,639 = 7,918.32/x
  3. Step 3: Cross multiply
    13,505.52x = 18,639 × 7,918.32
  4. Step 4: Simplify right side
    13,505.52x = 147,589,566.48
  5. Step 5: Solve for x
    x = 147,589,566.48/13,505.52
  6. Step 6: Final answer
    x = 10,928.09

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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.