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Finding the Fourth Proportional to 640.37, 955.09 and 543.51

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Solution

The fourth proportional to 640.37, 955.09 and 543.51 is: 810.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.37 : 955.09 = 543.51 : x
  2. Step 2: Convert to fraction form
    640.37/955.09 = 543.51/x
  3. Step 3: Cross multiply
    640.37x = 955.09 × 543.51
  4. Step 4: Simplify right side
    640.37x = 519,101.65
  5. Step 5: Solve for x
    x = 519,101.65/640.37
  6. Step 6: Final answer
    x = 810.62

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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.