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Finding the Fourth Proportional to 1,211.34, 1,671.46 and 739

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Solution

The fourth proportional to 1,211.34, 1,671.46 and 739 is: 1,019.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.34 : 1,671.46 = 739 : x
  2. Step 2: Convert to fraction form
    1,211.34/1,671.46 = 739/x
  3. Step 3: Cross multiply
    1,211.34x = 1,671.46 × 739
  4. Step 4: Simplify right side
    1,211.34x = 1,235,208.94
  5. Step 5: Solve for x
    x = 1,235,208.94/1,211.34
  6. Step 6: Final answer
    x = 1,019.70

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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.