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Finding the Fourth Proportional to 708.28, 1,057.21 and 657.56

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Solution

The fourth proportional to 708.28, 1,057.21 and 657.56 is: 981.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.28 : 1,057.21 = 657.56 : x
  2. Step 2: Convert to fraction form
    708.28/1,057.21 = 657.56/x
  3. Step 3: Cross multiply
    708.28x = 1,057.21 × 657.56
  4. Step 4: Simplify right side
    708.28x = 695,179.01
  5. Step 5: Solve for x
    x = 695,179.01/708.28
  6. Step 6: Final answer
    x = 981.50

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.