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Finding the Fourth Proportional to 415.64, 623.48 and 278.96

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Solution

The fourth proportional to 415.64, 623.48 and 278.96 is: 418.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.64 : 623.48 = 278.96 : x
  2. Step 2: Convert to fraction form
    415.64/623.48 = 278.96/x
  3. Step 3: Cross multiply
    415.64x = 623.48 × 278.96
  4. Step 4: Simplify right side
    415.64x = 173,925.98
  5. Step 5: Solve for x
    x = 173,925.98/415.64
  6. Step 6: Final answer
    x = 418.45

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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.