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Finding the Fourth Proportional to 1,687.69, 2,328.98 and 979.49

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Solution

The fourth proportional to 1,687.69, 2,328.98 and 979.49 is: 1,351.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,687.69 : 2,328.98 = 979.49 : x
  2. Step 2: Convert to fraction form
    1,687.69/2,328.98 = 979.49/x
  3. Step 3: Cross multiply
    1,687.69x = 2,328.98 × 979.49
  4. Step 4: Simplify right side
    1,687.69x = 2,281,212.62
  5. Step 5: Solve for x
    x = 2,281,212.62/1,687.69
  6. Step 6: Final answer
    x = 1,351.68

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1.5x scale

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.