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Finding the Fourth Proportional to 1,211.68, 1,817.34 and 442

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Solution

The fourth proportional to 1,211.68, 1,817.34 and 442 is: 662.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.68 : 1,817.34 = 442 : x
  2. Step 2: Convert to fraction form
    1,211.68/1,817.34 = 442/x
  3. Step 3: Cross multiply
    1,211.68x = 1,817.34 × 442
  4. Step 4: Simplify right side
    1,211.68x = 803,264.28
  5. Step 5: Solve for x
    x = 803,264.28/1,211.68
  6. Step 6: Final answer
    x = 662.93

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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.