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Finding the Fourth Proportional to 406.68, 561.16 and 276.08

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Solution

The fourth proportional to 406.68, 561.16 and 276.08 is: 380.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.68 : 561.16 = 276.08 : x
  2. Step 2: Convert to fraction form
    406.68/561.16 = 276.08/x
  3. Step 3: Cross multiply
    406.68x = 561.16 × 276.08
  4. Step 4: Simplify right side
    406.68x = 154,925.05
  5. Step 5: Solve for x
    x = 154,925.05/406.68
  6. Step 6: Final answer
    x = 380.95

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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.