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Finding the Fourth Proportional to 670.05, 1,005.19 and 207.72

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Solution

The fourth proportional to 670.05, 1,005.19 and 207.72 is: 311.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.05 : 1,005.19 = 207.72 : x
  2. Step 2: Convert to fraction form
    670.05/1,005.19 = 207.72/x
  3. Step 3: Cross multiply
    670.05x = 1,005.19 × 207.72
  4. Step 4: Simplify right side
    670.05x = 208,797.55
  5. Step 5: Solve for x
    x = 208,797.55/670.05
  6. Step 6: Final answer
    x = 311.61

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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.