Home / 12,390.69-18,588.87-4,071.36

Finding the Fourth Proportional to 12,390.69, 18,588.87 and 4,071.36

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Solution

The fourth proportional to 12,390.69, 18,588.87 and 4,071.36 is: 6,107.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,390.69 : 18,588.87 = 4,071.36 : x
  2. Step 2: Convert to fraction form
    12,390.69/18,588.87 = 4,071.36/x
  3. Step 3: Cross multiply
    12,390.69x = 18,588.87 × 4,071.36
  4. Step 4: Simplify right side
    12,390.69x = 75,681,981.76
  5. Step 5: Solve for x
    x = 75,681,981.76/12,390.69
  6. Step 6: Final answer
    x = 6,107.97

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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.