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Finding the Fourth Proportional to 18,927.60, 28,390.44 and 7,239.92

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Solution

The fourth proportional to 18,927.60, 28,390.44 and 7,239.92 is: 10,859.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,927.60 : 28,390.44 = 7,239.92 : x
  2. Step 2: Convert to fraction form
    18,927.60/28,390.44 = 7,239.92/x
  3. Step 3: Cross multiply
    18,927.60x = 28,390.44 × 7,239.92
  4. Step 4: Simplify right side
    18,927.60x = 205,544,514.36
  5. Step 5: Solve for x
    x = 205,544,514.36/18,927.60
  6. Step 6: Final answer
    x = 10,859.51

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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.