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Finding the Fourth Proportional to 640.41, 955.93 and 549.69

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Solution

The fourth proportional to 640.41, 955.93 and 549.69 is: 820.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.41 : 955.93 = 549.69 : x
  2. Step 2: Convert to fraction form
    640.41/955.93 = 549.69/x
  3. Step 3: Cross multiply
    640.41x = 955.93 × 549.69
  4. Step 4: Simplify right side
    640.41x = 525,465.16
  5. Step 5: Solve for x
    x = 525,465.16/640.41
  6. Step 6: Final answer
    x = 820.51

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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.