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Finding the Fourth Proportional to 1,212.80, 1,674.48 and 765.35

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Solution

The fourth proportional to 1,212.80, 1,674.48 and 765.35 is: 1,056.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.80 : 1,674.48 = 765.35 : x
  2. Step 2: Convert to fraction form
    1,212.80/1,674.48 = 765.35/x
  3. Step 3: Cross multiply
    1,212.80x = 1,674.48 × 765.35
  4. Step 4: Simplify right side
    1,212.80x = 1,281,563.27
  5. Step 5: Solve for x
    x = 1,281,563.27/1,212.80
  6. Step 6: Final answer
    x = 1,056.70

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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.