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Finding the Fourth Proportional to 1,281.51, 1,920.92 and 550.89

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Solution

The fourth proportional to 1,281.51, 1,920.92 and 550.89 is: 825.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.51 : 1,920.92 = 550.89 : x
  2. Step 2: Convert to fraction form
    1,281.51/1,920.92 = 550.89/x
  3. Step 3: Cross multiply
    1,281.51x = 1,920.92 × 550.89
  4. Step 4: Simplify right side
    1,281.51x = 1,058,212.86
  5. Step 5: Solve for x
    x = 1,058,212.86/1,281.51
  6. Step 6: Final answer
    x = 825.75

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1.5x scale

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.