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Finding the Fourth Proportional to 1,211.66, 1,817.75 and 691.91

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Solution

The fourth proportional to 1,211.66, 1,817.75 and 691.91 is: 1,038.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.66 : 1,817.75 = 691.91 : x
  2. Step 2: Convert to fraction form
    1,211.66/1,817.75 = 691.91/x
  3. Step 3: Cross multiply
    1,211.66x = 1,817.75 × 691.91
  4. Step 4: Simplify right side
    1,211.66x = 1,257,719.40
  5. Step 5: Solve for x
    x = 1,257,719.40/1,211.66
  6. Step 6: Final answer
    x = 1,038.01

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.