Home / 1,405.41-2,108.25-431.34

Finding the Fourth Proportional to 1,405.41, 2,108.25 and 431.34

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Solution

The fourth proportional to 1,405.41, 2,108.25 and 431.34 is: 647.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.41 : 2,108.25 = 431.34 : x
  2. Step 2: Convert to fraction form
    1,405.41/2,108.25 = 431.34/x
  3. Step 3: Cross multiply
    1,405.41x = 2,108.25 × 431.34
  4. Step 4: Simplify right side
    1,405.41x = 909,372.56
  5. Step 5: Solve for x
    x = 909,372.56/1,405.41
  6. Step 6: Final answer
    x = 647.05

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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.