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Finding the Fourth Proportional to 671.45, 1,005.28 and 454.64

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Solution

The fourth proportional to 671.45, 1,005.28 and 454.64 is: 680.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.45 : 1,005.28 = 454.64 : x
  2. Step 2: Convert to fraction form
    671.45/1,005.28 = 454.64/x
  3. Step 3: Cross multiply
    671.45x = 1,005.28 × 454.64
  4. Step 4: Simplify right side
    671.45x = 457,034.34
  5. Step 5: Solve for x
    x = 457,034.34/671.45
  6. Step 6: Final answer
    x = 680.67

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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.