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Finding the Fourth Proportional to 957.12, 1,321.20 and 677.76

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Solution

The fourth proportional to 957.12, 1,321.20 and 677.76 is: 935.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    957.12 : 1,321.20 = 677.76 : x
  2. Step 2: Convert to fraction form
    957.12/1,321.20 = 677.76/x
  3. Step 3: Cross multiply
    957.12x = 1,321.20 × 677.76
  4. Step 4: Simplify right side
    957.12x = 895,456.51
  5. Step 5: Solve for x
    x = 895,456.51/957.12
  6. Step 6: Final answer
    x = 935.57

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Double scale
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1.5x scale

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.