Home / 18,918.39-28,377.60-7,812.88

Finding the Fourth Proportional to 18,918.39, 28,377.60 and 7,812.88

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Solution

The fourth proportional to 18,918.39, 28,377.60 and 7,812.88 is: 11,719.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,918.39 : 28,377.60 = 7,812.88 : x
  2. Step 2: Convert to fraction form
    18,918.39/28,377.60 = 7,812.88/x
  3. Step 3: Cross multiply
    18,918.39x = 28,377.60 × 7,812.88
  4. Step 4: Simplify right side
    18,918.39x = 221,710,783.49
  5. Step 5: Solve for x
    x = 221,710,783.49/18,918.39
  6. Step 6: Final answer
    x = 11,719.33

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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.