Home / 1,281.20-1,921.56-415.68

Finding the Fourth Proportional to 1,281.20, 1,921.56 and 415.68

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Solution

The fourth proportional to 1,281.20, 1,921.56 and 415.68 is: 623.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.20 : 1,921.56 = 415.68 : x
  2. Step 2: Convert to fraction form
    1,281.20/1,921.56 = 415.68/x
  3. Step 3: Cross multiply
    1,281.20x = 1,921.56 × 415.68
  4. Step 4: Simplify right side
    1,281.20x = 798,754.06
  5. Step 5: Solve for x
    x = 798,754.06/1,281.20
  6. Step 6: Final answer
    x = 623.44

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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.