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Finding the Fourth Proportional to 621.69, 857.94 and 356.19

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Solution

The fourth proportional to 621.69, 857.94 and 356.19 is: 491.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.69 : 857.94 = 356.19 : x
  2. Step 2: Convert to fraction form
    621.69/857.94 = 356.19/x
  3. Step 3: Cross multiply
    621.69x = 857.94 × 356.19
  4. Step 4: Simplify right side
    621.69x = 305,587.87
  5. Step 5: Solve for x
    x = 305,587.87/621.69
  6. Step 6: Final answer
    x = 491.54

Related Problems

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Half scale
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Double scale
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1.5x scale

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.