Home / 2,920.19-4,379.81-840.11

Finding the Fourth Proportional to 2,920.19, 4,379.81 and 840.11

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Solution

The fourth proportional to 2,920.19, 4,379.81 and 840.11 is: 1,260.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,920.19 : 4,379.81 = 840.11 : x
  2. Step 2: Convert to fraction form
    2,920.19/4,379.81 = 840.11/x
  3. Step 3: Cross multiply
    2,920.19x = 4,379.81 × 840.11
  4. Step 4: Simplify right side
    2,920.19x = 3,679,496.08
  5. Step 5: Solve for x
    x = 3,679,496.08/2,920.19
  6. Step 6: Final answer
    x = 1,260.02

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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.