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Finding the Fourth Proportional to 957.36, 1,320.92 and 558.91

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Solution

The fourth proportional to 957.36, 1,320.92 and 558.91 is: 771.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    957.36 : 1,320.92 = 558.91 : x
  2. Step 2: Convert to fraction form
    957.36/1,320.92 = 558.91/x
  3. Step 3: Cross multiply
    957.36x = 1,320.92 × 558.91
  4. Step 4: Simplify right side
    957.36x = 738,268.79
  5. Step 5: Solve for x
    x = 738,268.79/957.36
  6. Step 6: Final answer
    x = 771.15

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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.