Home / 1,281.20-1,922.70-551.30

Finding the Fourth Proportional to 1,281.20, 1,922.70 and 551.30

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Solution

The fourth proportional to 1,281.20, 1,922.70 and 551.30 is: 827.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.20 : 1,922.70 = 551.30 : x
  2. Step 2: Convert to fraction form
    1,281.20/1,922.70 = 551.30/x
  3. Step 3: Cross multiply
    1,281.20x = 1,922.70 × 551.30
  4. Step 4: Simplify right side
    1,281.20x = 1,059,984.51
  5. Step 5: Solve for x
    x = 1,059,984.51/1,281.20
  6. Step 6: Final answer
    x = 827.34

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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.