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Finding the Fourth Proportional to 407.72, 561.75 and 267.60

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Solution

The fourth proportional to 407.72, 561.75 and 267.60 is: 368.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.72 : 561.75 = 267.60 : x
  2. Step 2: Convert to fraction form
    407.72/561.75 = 267.60/x
  3. Step 3: Cross multiply
    407.72x = 561.75 × 267.60
  4. Step 4: Simplify right side
    407.72x = 150,324.03
  5. Step 5: Solve for x
    x = 150,324.03/407.72
  6. Step 6: Final answer
    x = 368.69

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.