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Finding the Fourth Proportional to 1,211.08, 1,815.18 and 921.64

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Solution

The fourth proportional to 1,211.08, 1,815.18 and 921.64 is: 1,381.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.08 : 1,815.18 = 921.64 : x
  2. Step 2: Convert to fraction form
    1,211.08/1,815.18 = 921.64/x
  3. Step 3: Cross multiply
    1,211.08x = 1,815.18 × 921.64
  4. Step 4: Simplify right side
    1,211.08x = 1,672,942.50
  5. Step 5: Solve for x
    x = 1,672,942.50/1,211.08
  6. Step 6: Final answer
    x = 1,381.36

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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.