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Finding the Fourth Proportional to 670.44, 1,005.35 and 280.38

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Solution

The fourth proportional to 670.44, 1,005.35 and 280.38 is: 420.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.44 : 1,005.35 = 280.38 : x
  2. Step 2: Convert to fraction form
    670.44/1,005.35 = 280.38/x
  3. Step 3: Cross multiply
    670.44x = 1,005.35 × 280.38
  4. Step 4: Simplify right side
    670.44x = 281,878.63
  5. Step 5: Solve for x
    x = 281,878.63/670.44
  6. Step 6: Final answer
    x = 420.44

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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.