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Finding the Fourth Proportional to 1,245.75, 1,719.15 and 693.75

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Solution

The fourth proportional to 1,245.75, 1,719.15 and 693.75 is: 957.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.75 : 1,719.15 = 693.75 : x
  2. Step 2: Convert to fraction form
    1,245.75/1,719.15 = 693.75/x
  3. Step 3: Cross multiply
    1,245.75x = 1,719.15 × 693.75
  4. Step 4: Simplify right side
    1,245.75x = 1,192,660.31
  5. Step 5: Solve for x
    x = 1,192,660.31/1,245.75
  6. Step 6: Final answer
    x = 957.38

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Half scale
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Double scale
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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.