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Finding the Fourth Proportional to 1,244.70, 1,717.69 and 685.20

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Solution

The fourth proportional to 1,244.70, 1,717.69 and 685.20 is: 945.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,244.70 : 1,717.69 = 685.20 : x
  2. Step 2: Convert to fraction form
    1,244.70/1,717.69 = 685.20/x
  3. Step 3: Cross multiply
    1,244.70x = 1,717.69 × 685.20
  4. Step 4: Simplify right side
    1,244.70x = 1,176,961.19
  5. Step 5: Solve for x
    x = 1,176,961.19/1,244.70
  6. Step 6: Final answer
    x = 945.58

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Half 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.