Home / 1,765.40-2,436.08-979.39

Finding the Fourth Proportional to 1,765.40, 2,436.08 and 979.39

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Solution

The fourth proportional to 1,765.40, 2,436.08 and 979.39 is: 1,351.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,765.40 : 2,436.08 = 979.39 : x
  2. Step 2: Convert to fraction form
    1,765.40/2,436.08 = 979.39/x
  3. Step 3: Cross multiply
    1,765.40x = 2,436.08 × 979.39
  4. Step 4: Simplify right side
    1,765.40x = 2,385,870.54
  5. Step 5: Solve for x
    x = 2,385,870.54/1,765.40
  6. Step 6: Final answer
    x = 1,351.47

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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.