Home / 1,539.39-2,123.69-979.67

Finding the Fourth Proportional to 1,539.39, 2,123.69 and 979.67

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Solution

The fourth proportional to 1,539.39, 2,123.69 and 979.67 is: 1,351.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,539.39 : 2,123.69 = 979.67 : x
  2. Step 2: Convert to fraction form
    1,539.39/2,123.69 = 979.67/x
  3. Step 3: Cross multiply
    1,539.39x = 2,123.69 × 979.67
  4. Step 4: Simplify right side
    1,539.39x = 2,080,499.87
  5. Step 5: Solve for x
    x = 2,080,499.87/1,539.39
  6. Step 6: Final answer
    x = 1,351.51

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1.5x scale

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.