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Finding the Fourth Proportional to 1,213.40, 1,674.44 and 661.40

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Solution

The fourth proportional to 1,213.40, 1,674.44 and 661.40 is: 912.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.40 : 1,674.44 = 661.40 : x
  2. Step 2: Convert to fraction form
    1,213.40/1,674.44 = 661.40/x
  3. Step 3: Cross multiply
    1,213.40x = 1,674.44 × 661.40
  4. Step 4: Simplify right side
    1,213.40x = 1,107,474.62
  5. Step 5: Solve for x
    x = 1,107,474.62/1,213.40
  6. Step 6: Final answer
    x = 912.70

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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.