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Finding the Fourth Proportional to 1,212.21, 1,672.82 and 708.16

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Solution

The fourth proportional to 1,212.21, 1,672.82 and 708.16 is: 977.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.21 : 1,672.82 = 708.16 : x
  2. Step 2: Convert to fraction form
    1,212.21/1,672.82 = 708.16/x
  3. Step 3: Cross multiply
    1,212.21x = 1,672.82 × 708.16
  4. Step 4: Simplify right side
    1,212.21x = 1,184,624.21
  5. Step 5: Solve for x
    x = 1,184,624.21/1,212.21
  6. Step 6: Final answer
    x = 977.24

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.