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Finding the Fourth Proportional to 957.45, 1,321.21 and 564.45

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Solution

The fourth proportional to 957.45, 1,321.21 and 564.45 is: 778.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    957.45 : 1,321.21 = 564.45 : x
  2. Step 2: Convert to fraction form
    957.45/1,321.21 = 564.45/x
  3. Step 3: Cross multiply
    957.45x = 1,321.21 × 564.45
  4. Step 4: Simplify right side
    957.45x = 745,756.98
  5. Step 5: Solve for x
    x = 745,756.98/957.45
  6. Step 6: Final answer
    x = 778.90

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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.