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Finding the Fourth Proportional to 1,212.80, 1,673.70 and 688.84

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Solution

The fourth proportional to 1,212.80, 1,673.70 and 688.84 is: 950.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.80 : 1,673.70 = 688.84 : x
  2. Step 2: Convert to fraction form
    1,212.80/1,673.70 = 688.84/x
  3. Step 3: Cross multiply
    1,212.80x = 1,673.70 × 688.84
  4. Step 4: Simplify right side
    1,212.80x = 1,152,911.51
  5. Step 5: Solve for x
    x = 1,152,911.51/1,212.80
  6. Step 6: Final answer
    x = 950.62

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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.