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Finding the Fourth Proportional to 751.79, 1,128.40 and 367.31

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Solution

The fourth proportional to 751.79, 1,128.40 and 367.31 is: 551.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.79 : 1,128.40 = 367.31 : x
  2. Step 2: Convert to fraction form
    751.79/1,128.40 = 367.31/x
  3. Step 3: Cross multiply
    751.79x = 1,128.40 × 367.31
  4. Step 4: Simplify right side
    751.79x = 414,472.60
  5. Step 5: Solve for x
    x = 414,472.60/751.79
  6. Step 6: Final answer
    x = 551.31

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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.