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Finding the Fourth Proportional to 957.33, 1,321.65 and 891.72

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Solution

The fourth proportional to 957.33, 1,321.65 and 891.72 is: 1,231.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    957.33 : 1,321.65 = 891.72 : x
  2. Step 2: Convert to fraction form
    957.33/1,321.65 = 891.72/x
  3. Step 3: Cross multiply
    957.33x = 1,321.65 × 891.72
  4. Step 4: Simplify right side
    957.33x = 1,178,541.74
  5. Step 5: Solve for x
    x = 1,178,541.74/957.33
  6. Step 6: Final answer
    x = 1,231.07

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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.