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Finding the Fourth Proportional to 611.05, 843.10 and 345.50

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Solution

The fourth proportional to 611.05, 843.10 and 345.50 is: 476.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.05 : 843.10 = 345.50 : x
  2. Step 2: Convert to fraction form
    611.05/843.10 = 345.50/x
  3. Step 3: Cross multiply
    611.05x = 843.10 × 345.50
  4. Step 4: Simplify right side
    611.05x = 291,290.24
  5. Step 5: Solve for x
    x = 291,290.24/611.05
  6. Step 6: Final answer
    x = 476.70

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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.