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Finding the Fourth Proportional to 1,211.93, 1,671.90 and 757.98

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Solution

The fourth proportional to 1,211.93, 1,671.90 and 757.98 is: 1,045.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.93 : 1,671.90 = 757.98 : x
  2. Step 2: Convert to fraction form
    1,211.93/1,671.90 = 757.98/x
  3. Step 3: Cross multiply
    1,211.93x = 1,671.90 × 757.98
  4. Step 4: Simplify right side
    1,211.93x = 1,267,263.92
  5. Step 5: Solve for x
    x = 1,267,263.92/1,211.93
  6. Step 6: Final answer
    x = 1,045.65

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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.