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Finding the Fourth Proportional to 510.55, 765.73 and 218.21

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Solution

The fourth proportional to 510.55, 765.73 and 218.21 is: 327.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    510.55 : 765.73 = 218.21 : x
  2. Step 2: Convert to fraction form
    510.55/765.73 = 218.21/x
  3. Step 3: Cross multiply
    510.55x = 765.73 × 218.21
  4. Step 4: Simplify right side
    510.55x = 167,092.75
  5. Step 5: Solve for x
    x = 167,092.75/510.55
  6. Step 6: Final answer
    x = 327.28

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1.5x scale

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.