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Finding the Fourth Proportional to 18,782.68, 25,915 and 11,225.64

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Solution

The fourth proportional to 18,782.68, 25,915 and 11,225.64 is: 15,488.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,782.68 : 25,915 = 11,225.64 : x
  2. Step 2: Convert to fraction form
    18,782.68/25,915 = 11,225.64/x
  3. Step 3: Cross multiply
    18,782.68x = 25,915 × 11,225.64
  4. Step 4: Simplify right side
    18,782.68x = 290,912,460.60
  5. Step 5: Solve for x
    x = 290,912,460.60/18,782.68
  6. Step 6: Final answer
    x = 15,488.34

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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.