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Finding the Fourth Proportional to 1,330.21, 1,995.54 and 549.78

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Solution

The fourth proportional to 1,330.21, 1,995.54 and 549.78 is: 824.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,330.21 : 1,995.54 = 549.78 : x
  2. Step 2: Convert to fraction form
    1,330.21/1,995.54 = 549.78/x
  3. Step 3: Cross multiply
    1,330.21x = 1,995.54 × 549.78
  4. Step 4: Simplify right side
    1,330.21x = 1,097,107.98
  5. Step 5: Solve for x
    x = 1,097,107.98/1,330.21
  6. Step 6: Final answer
    x = 824.76

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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.