Home / 1,281.42-1,921.20-448.35

Finding the Fourth Proportional to 1,281.42, 1,921.20 and 448.35

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Solution

The fourth proportional to 1,281.42, 1,921.20 and 448.35 is: 672.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.42 : 1,921.20 = 448.35 : x
  2. Step 2: Convert to fraction form
    1,281.42/1,921.20 = 448.35/x
  3. Step 3: Cross multiply
    1,281.42x = 1,921.20 × 448.35
  4. Step 4: Simplify right side
    1,281.42x = 861,370.02
  5. Step 5: Solve for x
    x = 861,370.02/1,281.42
  6. Step 6: Final answer
    x = 672.20

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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.