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Finding the Fourth Proportional to 957.73, 1,320.96 and 621.72

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Solution

The fourth proportional to 957.73, 1,320.96 and 621.72 is: 857.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    957.73 : 1,320.96 = 621.72 : x
  2. Step 2: Convert to fraction form
    957.73/1,320.96 = 621.72/x
  3. Step 3: Cross multiply
    957.73x = 1,320.96 × 621.72
  4. Step 4: Simplify right side
    957.73x = 821,260.65
  5. Step 5: Solve for x
    x = 821,260.65/957.73
  6. Step 6: Final answer
    x = 857.51

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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.