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Finding the Fourth Proportional to 670.72, 1,006.40 and 300.64

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Solution

The fourth proportional to 670.72, 1,006.40 and 300.64 is: 451.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.72 : 1,006.40 = 300.64 : x
  2. Step 2: Convert to fraction form
    670.72/1,006.40 = 300.64/x
  3. Step 3: Cross multiply
    670.72x = 1,006.40 × 300.64
  4. Step 4: Simplify right side
    670.72x = 302,564.10
  5. Step 5: Solve for x
    x = 302,564.10/670.72
  6. Step 6: Final answer
    x = 451.10

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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.