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Finding the Fourth Proportional to 957.85, 1,321.84 and 559.79

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Solution

The fourth proportional to 957.85, 1,321.84 and 559.79 is: 772.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    957.85 : 1,321.84 = 559.79 : x
  2. Step 2: Convert to fraction form
    957.85/1,321.84 = 559.79/x
  3. Step 3: Cross multiply
    957.85x = 1,321.84 × 559.79
  4. Step 4: Simplify right side
    957.85x = 739,946.71
  5. Step 5: Solve for x
    x = 739,946.71/957.85
  6. Step 6: Final answer
    x = 772.51

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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.