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Finding the Fourth Proportional to 1,211.87, 1,672.36 and 714.53

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Solution

The fourth proportional to 1,211.87, 1,672.36 and 714.53 is: 986.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.87 : 1,672.36 = 714.53 : x
  2. Step 2: Convert to fraction form
    1,211.87/1,672.36 = 714.53/x
  3. Step 3: Cross multiply
    1,211.87x = 1,672.36 × 714.53
  4. Step 4: Simplify right side
    1,211.87x = 1,194,951.39
  5. Step 5: Solve for x
    x = 1,194,951.39/1,211.87
  6. Step 6: Final answer
    x = 986.04

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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.