Home / 1,939.51-2,909.37-478.67

Finding the Fourth Proportional to 1,939.51, 2,909.37 and 478.67

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Solution

The fourth proportional to 1,939.51, 2,909.37 and 478.67 is: 718.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,939.51 : 2,909.37 = 478.67 : x
  2. Step 2: Convert to fraction form
    1,939.51/2,909.37 = 478.67/x
  3. Step 3: Cross multiply
    1,939.51x = 2,909.37 × 478.67
  4. Step 4: Simplify right side
    1,939.51x = 1,392,628.14
  5. Step 5: Solve for x
    x = 1,392,628.14/1,939.51
  6. Step 6: Final answer
    x = 718.03

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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.