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Finding the Fourth Proportional to 510.45, 765.78 and 202.56

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Solution

The fourth proportional to 510.45, 765.78 and 202.56 is: 303.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    510.45 : 765.78 = 202.56 : x
  2. Step 2: Convert to fraction form
    510.45/765.78 = 202.56/x
  3. Step 3: Cross multiply
    510.45x = 765.78 × 202.56
  4. Step 4: Simplify right side
    510.45x = 155,116.40
  5. Step 5: Solve for x
    x = 155,116.40/510.45
  6. Step 6: Final answer
    x = 303.88

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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.