Home / 15,390.27-21,240.57-8,678

Finding the Fourth Proportional to 15,390.27, 21,240.57 and 8,678

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Solution

The fourth proportional to 15,390.27, 21,240.57 and 8,678 is: 11,976.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,390.27 : 21,240.57 = 8,678 : x
  2. Step 2: Convert to fraction form
    15,390.27/21,240.57 = 8,678/x
  3. Step 3: Cross multiply
    15,390.27x = 21,240.57 × 8,678
  4. Step 4: Simplify right side
    15,390.27x = 184,325,666.46
  5. Step 5: Solve for x
    x = 184,325,666.46/15,390.27
  6. Step 6: Final answer
    x = 11,976.77

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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.