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Finding the Fourth Proportional to 1,289.85, 1,935.54 and 549.43

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Solution

The fourth proportional to 1,289.85, 1,935.54 and 549.43 is: 824.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.85 : 1,935.54 = 549.43 : x
  2. Step 2: Convert to fraction form
    1,289.85/1,935.54 = 549.43/x
  3. Step 3: Cross multiply
    1,289.85x = 1,935.54 × 549.43
  4. Step 4: Simplify right side
    1,289.85x = 1,063,443.74
  5. Step 5: Solve for x
    x = 1,063,443.74/1,289.85
  6. Step 6: Final answer
    x = 824.47

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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.