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Finding the Fourth Proportional to 640.75, 955.65 and 543.89

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Solution

The fourth proportional to 640.75, 955.65 and 543.89 is: 811.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.75 : 955.65 = 543.89 : x
  2. Step 2: Convert to fraction form
    640.75/955.65 = 543.89/x
  3. Step 3: Cross multiply
    640.75x = 955.65 × 543.89
  4. Step 4: Simplify right side
    640.75x = 519,763.70
  5. Step 5: Solve for x
    x = 519,763.70/640.75
  6. Step 6: Final answer
    x = 811.18

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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.