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Finding the Fourth Proportional to 1,390.45, 2,084.16 and 650.42

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Solution

The fourth proportional to 1,390.45, 2,084.16 and 650.42 is: 974.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.45 : 2,084.16 = 650.42 : x
  2. Step 2: Convert to fraction form
    1,390.45/2,084.16 = 650.42/x
  3. Step 3: Cross multiply
    1,390.45x = 2,084.16 × 650.42
  4. Step 4: Simplify right side
    1,390.45x = 1,355,579.35
  5. Step 5: Solve for x
    x = 1,355,579.35/1,390.45
  6. Step 6: Final answer
    x = 974.92

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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.