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Finding the Fourth Proportional to 956.67, 1,320.20 and 558.60

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Solution

The fourth proportional to 956.67, 1,320.20 and 558.60 is: 770.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    956.67 : 1,320.20 = 558.60 : x
  2. Step 2: Convert to fraction form
    956.67/1,320.20 = 558.60/x
  3. Step 3: Cross multiply
    956.67x = 1,320.20 × 558.60
  4. Step 4: Simplify right side
    956.67x = 737,460.93
  5. Step 5: Solve for x
    x = 737,460.93/956.67
  6. Step 6: Final answer
    x = 770.86

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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.