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Finding the Fourth Proportional to 957.11, 1,320.75 and 878.69

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Solution

The fourth proportional to 957.11, 1,320.75 and 878.69 is: 1,212.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    957.11 : 1,320.75 = 878.69 : x
  2. Step 2: Convert to fraction form
    957.11/1,320.75 = 878.69/x
  3. Step 3: Cross multiply
    957.11x = 1,320.75 × 878.69
  4. Step 4: Simplify right side
    957.11x = 1,160,528.79
  5. Step 5: Solve for x
    x = 1,160,528.79/957.11
  6. Step 6: Final answer
    x = 1,212.53

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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.