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Finding the Fourth Proportional to 957.66, 1,320.33 and 708.55

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Solution

The fourth proportional to 957.66, 1,320.33 and 708.55 is: 976.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    957.66 : 1,320.33 = 708.55 : x
  2. Step 2: Convert to fraction form
    957.66/1,320.33 = 708.55/x
  3. Step 3: Cross multiply
    957.66x = 1,320.33 × 708.55
  4. Step 4: Simplify right side
    957.66x = 935,519.18
  5. Step 5: Solve for x
    x = 935,519.18/957.66
  6. Step 6: Final answer
    x = 976.88

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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.