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Finding the Fourth Proportional to 1,277.99, 1,764.49 and 978.70

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Solution

The fourth proportional to 1,277.99, 1,764.49 and 978.70 is: 1,351.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,277.99 : 1,764.49 = 978.70 : x
  2. Step 2: Convert to fraction form
    1,277.99/1,764.49 = 978.70/x
  3. Step 3: Cross multiply
    1,277.99x = 1,764.49 × 978.70
  4. Step 4: Simplify right side
    1,277.99x = 1,726,917.21
  5. Step 5: Solve for x
    x = 1,726,917.21/1,277.99
  6. Step 6: Final answer
    x = 1,351.28

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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.