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Finding the Fourth Proportional to 670.72, 1,005.20 and 305.44

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Solution

The fourth proportional to 670.72, 1,005.20 and 305.44 is: 457.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.72 : 1,005.20 = 305.44 : x
  2. Step 2: Convert to fraction form
    670.72/1,005.20 = 305.44/x
  3. Step 3: Cross multiply
    670.72x = 1,005.20 × 305.44
  4. Step 4: Simplify right side
    670.72x = 307,028.29
  5. Step 5: Solve for x
    x = 307,028.29/670.72
  6. Step 6: Final answer
    x = 457.76

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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.