Home / 1,281.12-1,921.86-415.56

Finding the Fourth Proportional to 1,281.12, 1,921.86 and 415.56

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Solution

The fourth proportional to 1,281.12, 1,921.86 and 415.56 is: 623.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.12 : 1,921.86 = 415.56 : x
  2. Step 2: Convert to fraction form
    1,281.12/1,921.86 = 415.56/x
  3. Step 3: Cross multiply
    1,281.12x = 1,921.86 × 415.56
  4. Step 4: Simplify right side
    1,281.12x = 798,648.14
  5. Step 5: Solve for x
    x = 798,648.14/1,281.12
  6. Step 6: Final answer
    x = 623.40

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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.