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Finding the Fourth Proportional to 453.12, 678.60 and 279.87

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Solution

The fourth proportional to 453.12, 678.60 and 279.87 is: 419.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    453.12 : 678.60 = 279.87 : x
  2. Step 2: Convert to fraction form
    453.12/678.60 = 279.87/x
  3. Step 3: Cross multiply
    453.12x = 678.60 × 279.87
  4. Step 4: Simplify right side
    453.12x = 189,919.78
  5. Step 5: Solve for x
    x = 189,919.78/453.12
  6. Step 6: Final answer
    x = 419.14

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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.