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Finding the Fourth Proportional to 407.26, 561.90 and 276.64

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Solution

The fourth proportional to 407.26, 561.90 and 276.64 is: 381.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.26 : 561.90 = 276.64 : x
  2. Step 2: Convert to fraction form
    407.26/561.90 = 276.64/x
  3. Step 3: Cross multiply
    407.26x = 561.90 × 276.64
  4. Step 4: Simplify right side
    407.26x = 155,444.02
  5. Step 5: Solve for x
    x = 155,444.02/407.26
  6. Step 6: Final answer
    x = 381.68

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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.