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Finding the Fourth Proportional to 955.50, 1,318.57 and 557.02

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Solution

The fourth proportional to 955.50, 1,318.57 and 557.02 is: 768.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.50 : 1,318.57 = 557.02 : x
  2. Step 2: Convert to fraction form
    955.50/1,318.57 = 557.02/x
  3. Step 3: Cross multiply
    955.50x = 1,318.57 × 557.02
  4. Step 4: Simplify right side
    955.50x = 734,469.86
  5. Step 5: Solve for x
    x = 734,469.86/955.50
  6. Step 6: Final answer
    x = 768.68

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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.