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Finding the Fourth Proportional to 1,171.40, 1,616.70 and 674.14

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Solution

The fourth proportional to 1,171.40, 1,616.70 and 674.14 is: 930.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,171.40 : 1,616.70 = 674.14 : x
  2. Step 2: Convert to fraction form
    1,171.40/1,616.70 = 674.14/x
  3. Step 3: Cross multiply
    1,171.40x = 1,616.70 × 674.14
  4. Step 4: Simplify right side
    1,171.40x = 1,089,882.14
  5. Step 5: Solve for x
    x = 1,089,882.14/1,171.40
  6. Step 6: Final answer
    x = 930.41

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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.