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Finding the Fourth Proportional to 956.82, 1,320.66 and 558.80

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Solution

The fourth proportional to 956.82, 1,320.66 and 558.80 is: 771.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    956.82 : 1,320.66 = 558.80 : x
  2. Step 2: Convert to fraction form
    956.82/1,320.66 = 558.80/x
  3. Step 3: Cross multiply
    956.82x = 1,320.66 × 558.80
  4. Step 4: Simplify right side
    956.82x = 737,984.81
  5. Step 5: Solve for x
    x = 737,984.81/956.82
  6. Step 6: Final answer
    x = 771.29

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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.