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Finding the Fourth Proportional to 621.63, 855.90 and 528.17

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Solution

The fourth proportional to 621.63, 855.90 and 528.17 is: 727.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.63 : 855.90 = 528.17 : x
  2. Step 2: Convert to fraction form
    621.63/855.90 = 528.17/x
  3. Step 3: Cross multiply
    621.63x = 855.90 × 528.17
  4. Step 4: Simplify right side
    621.63x = 452,056.42
  5. Step 5: Solve for x
    x = 452,056.42/621.63
  6. Step 6: Final answer
    x = 727.21

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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.