Home / 1,281.29-1,921.86-415.60

Finding the Fourth Proportional to 1,281.29, 1,921.86 and 415.60

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Solution

The fourth proportional to 1,281.29, 1,921.86 and 415.60 is: 623.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.29 : 1,921.86 = 415.60 : x
  2. Step 2: Convert to fraction form
    1,281.29/1,921.86 = 415.60/x
  3. Step 3: Cross multiply
    1,281.29x = 1,921.86 × 415.60
  4. Step 4: Simplify right side
    1,281.29x = 798,720.21
  5. Step 5: Solve for x
    x = 798,720.21/1,281.29
  6. Step 6: Final answer
    x = 623.37

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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.