Home / 1,281.21-1,921.76-415.52

Finding the Fourth Proportional to 1,281.21, 1,921.76 and 415.52

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Solution

The fourth proportional to 1,281.21, 1,921.76 and 415.52 is: 623.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.21 : 1,921.76 = 415.52 : x
  2. Step 2: Convert to fraction form
    1,281.21/1,921.76 = 415.52/x
  3. Step 3: Cross multiply
    1,281.21x = 1,921.76 × 415.52
  4. Step 4: Simplify right side
    1,281.21x = 798,529.72
  5. Step 5: Solve for x
    x = 798,529.72/1,281.21
  6. Step 6: Final answer
    x = 623.26

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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.