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Finding the Fourth Proportional to 1,388.75, 1,916.48 and 767.75

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Solution

The fourth proportional to 1,388.75, 1,916.48 and 767.75 is: 1,059.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.75 : 1,916.48 = 767.75 : x
  2. Step 2: Convert to fraction form
    1,388.75/1,916.48 = 767.75/x
  3. Step 3: Cross multiply
    1,388.75x = 1,916.48 × 767.75
  4. Step 4: Simplify right side
    1,388.75x = 1,471,377.52
  5. Step 5: Solve for x
    x = 1,471,377.52/1,388.75
  6. Step 6: Final answer
    x = 1,059.50

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Half scale
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Double scale
Find fourth proportional to 1,389.75, 1,917.86 and 768.75
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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.