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Finding the Fourth Proportional to 957.96, 1,321.23 and 621.50

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Solution

The fourth proportional to 957.96, 1,321.23 and 621.50 is: 857.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    957.96 : 1,321.23 = 621.50 : x
  2. Step 2: Convert to fraction form
    957.96/1,321.23 = 621.50/x
  3. Step 3: Cross multiply
    957.96x = 1,321.23 × 621.50
  4. Step 4: Simplify right side
    957.96x = 821,141.26
  5. Step 5: Solve for x
    x = 821,141.26/957.96
  6. Step 6: Final answer
    x = 857.17

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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.