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Finding the Fourth Proportional to 611.20, 854.60 and 611.20

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Solution

The fourth proportional to 611.20, 854.60 and 611.20 is: 854.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.20 : 854.60 = 611.20 : x
  2. Step 2: Convert to fraction form
    611.20/854.60 = 611.20/x
  3. Step 3: Cross multiply
    611.20x = 854.60 × 611.20
  4. Step 4: Simplify right side
    611.20x = 522,331.52
  5. Step 5: Solve for x
    x = 522,331.52/611.20
  6. Step 6: Final answer
    x = 854.60

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.