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Finding the Fourth Proportional to 640.14, 955.54 and 549.42

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Solution

The fourth proportional to 640.14, 955.54 and 549.42 is: 820.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.14 : 955.54 = 549.42 : x
  2. Step 2: Convert to fraction form
    640.14/955.54 = 549.42/x
  3. Step 3: Cross multiply
    640.14x = 955.54 × 549.42
  4. Step 4: Simplify right side
    640.14x = 524,992.79
  5. Step 5: Solve for x
    x = 524,992.79/640.14
  6. Step 6: Final answer
    x = 820.12

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.