Home / 1,539.54-2,123.82-979.38

Finding the Fourth Proportional to 1,539.54, 2,123.82 and 979.38

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Solution

The fourth proportional to 1,539.54, 2,123.82 and 979.38 is: 1,351.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,539.54 : 2,123.82 = 979.38 : x
  2. Step 2: Convert to fraction form
    1,539.54/2,123.82 = 979.38/x
  3. Step 3: Cross multiply
    1,539.54x = 2,123.82 × 979.38
  4. Step 4: Simplify right side
    1,539.54x = 2,080,026.83
  5. Step 5: Solve for x
    x = 2,080,026.83/1,539.54
  6. Step 6: Final answer
    x = 1,351.07

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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.