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Finding the Fourth Proportional to 949.64, 1,421.34 and 670.79

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Solution

The fourth proportional to 949.64, 1,421.34 and 670.79 is: 1,003.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.64 : 1,421.34 = 670.79 : x
  2. Step 2: Convert to fraction form
    949.64/1,421.34 = 670.79/x
  3. Step 3: Cross multiply
    949.64x = 1,421.34 × 670.79
  4. Step 4: Simplify right side
    949.64x = 953,420.66
  5. Step 5: Solve for x
    x = 953,420.66/949.64
  6. Step 6: Final answer
    x = 1,003.98

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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.