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Finding the Fourth Proportional to 621.56, 857.58 and 356

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Solution

The fourth proportional to 621.56, 857.58 and 356 is: 491.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.56 : 857.58 = 356 : x
  2. Step 2: Convert to fraction form
    621.56/857.58 = 356/x
  3. Step 3: Cross multiply
    621.56x = 857.58 × 356
  4. Step 4: Simplify right side
    621.56x = 305,298.48
  5. Step 5: Solve for x
    x = 305,298.48/621.56
  6. Step 6: Final answer
    x = 491.18

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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.