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Finding the Fourth Proportional to 661.20, 994.20 and 555.60

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Solution

The fourth proportional to 661.20, 994.20 and 555.60 is: 835.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.20 : 994.20 = 555.60 : x
  2. Step 2: Convert to fraction form
    661.20/994.20 = 555.60/x
  3. Step 3: Cross multiply
    661.20x = 994.20 × 555.60
  4. Step 4: Simplify right side
    661.20x = 552,377.52
  5. Step 5: Solve for x
    x = 552,377.52/661.20
  6. Step 6: Final answer
    x = 835.42

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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.