Home / 1,405.08-2,107.81-480.40

Finding the Fourth Proportional to 1,405.08, 2,107.81 and 480.40

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Solution

The fourth proportional to 1,405.08, 2,107.81 and 480.40 is: 720.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.08 : 2,107.81 = 480.40 : x
  2. Step 2: Convert to fraction form
    1,405.08/2,107.81 = 480.40/x
  3. Step 3: Cross multiply
    1,405.08x = 2,107.81 × 480.40
  4. Step 4: Simplify right side
    1,405.08x = 1,012,587.25
  5. Step 5: Solve for x
    x = 1,012,587.25/1,405.08
  6. Step 6: Final answer
    x = 720.66

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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.