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Finding the Fourth Proportional to 629.60, 942.60 and 611.60

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Solution

The fourth proportional to 629.60, 942.60 and 611.60 is: 915.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.60 : 942.60 = 611.60 : x
  2. Step 2: Convert to fraction form
    629.60/942.60 = 611.60/x
  3. Step 3: Cross multiply
    629.60x = 942.60 × 611.60
  4. Step 4: Simplify right side
    629.60x = 576,494.16
  5. Step 5: Solve for x
    x = 576,494.16/629.60
  6. Step 6: Final answer
    x = 915.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.