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Finding the Fourth Proportional to 1,940.32, 2,910.05 and 553.63

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Solution

The fourth proportional to 1,940.32, 2,910.05 and 553.63 is: 830.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,940.32 : 2,910.05 = 553.63 : x
  2. Step 2: Convert to fraction form
    1,940.32/2,910.05 = 553.63/x
  3. Step 3: Cross multiply
    1,940.32x = 2,910.05 × 553.63
  4. Step 4: Simplify right side
    1,940.32x = 1,611,090.98
  5. Step 5: Solve for x
    x = 1,611,090.98/1,940.32
  6. Step 6: Final answer
    x = 830.32

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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.