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Finding the Fourth Proportional to 1,283.66, 1,771.45 and 694.20

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Solution

The fourth proportional to 1,283.66, 1,771.45 and 694.20 is: 957.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,283.66 : 1,771.45 = 694.20 : x
  2. Step 2: Convert to fraction form
    1,283.66/1,771.45 = 694.20/x
  3. Step 3: Cross multiply
    1,283.66x = 1,771.45 × 694.20
  4. Step 4: Simplify right side
    1,283.66x = 1,229,731.73
  5. Step 5: Solve for x
    x = 1,229,731.73/1,283.66
  6. Step 6: Final answer
    x = 957.99

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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.