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Finding the Fourth Proportional to 620.95, 855.57 and 521.02

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Solution

The fourth proportional to 620.95, 855.57 and 521.02 is: 717.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.95 : 855.57 = 521.02 : x
  2. Step 2: Convert to fraction form
    620.95/855.57 = 521.02/x
  3. Step 3: Cross multiply
    620.95x = 855.57 × 521.02
  4. Step 4: Simplify right side
    620.95x = 445,769.08
  5. Step 5: Solve for x
    x = 445,769.08/620.95
  6. Step 6: Final answer
    x = 717.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.