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Finding the Fourth Proportional to 957.22, 1,321 and 621.19

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Solution

The fourth proportional to 957.22, 1,321 and 621.19 is: 857.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    957.22 : 1,321 = 621.19 : x
  2. Step 2: Convert to fraction form
    957.22/1,321 = 621.19/x
  3. Step 3: Cross multiply
    957.22x = 1,321 × 621.19
  4. Step 4: Simplify right side
    957.22x = 820,591.99
  5. Step 5: Solve for x
    x = 820,591.99/957.22
  6. Step 6: Final answer
    x = 857.27

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.