Home / 1,405.35-2,107.85-431.55

Finding the Fourth Proportional to 1,405.35, 2,107.85 and 431.55

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Solution

The fourth proportional to 1,405.35, 2,107.85 and 431.55 is: 647.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.35 : 2,107.85 = 431.55 : x
  2. Step 2: Convert to fraction form
    1,405.35/2,107.85 = 431.55/x
  3. Step 3: Cross multiply
    1,405.35x = 2,107.85 × 431.55
  4. Step 4: Simplify right side
    1,405.35x = 909,640.51
  5. Step 5: Solve for x
    x = 909,640.51/1,405.35
  6. Step 6: Final answer
    x = 647.27

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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.