Home / 1,479.12-2,042.16-920.40

Finding the Fourth Proportional to 1,479.12, 2,042.16 and 920.40

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Solution

The fourth proportional to 1,479.12, 2,042.16 and 920.40 is: 1,270.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,479.12 : 2,042.16 = 920.40 : x
  2. Step 2: Convert to fraction form
    1,479.12/2,042.16 = 920.40/x
  3. Step 3: Cross multiply
    1,479.12x = 2,042.16 × 920.40
  4. Step 4: Simplify right side
    1,479.12x = 1,879,604.06
  5. Step 5: Solve for x
    x = 1,879,604.06/1,479.12
  6. Step 6: Final answer
    x = 1,270.76

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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.