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Finding the Fourth Proportional to 406.83, 611.60 and 315.57

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Solution

The fourth proportional to 406.83, 611.60 and 315.57 is: 474.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.83 : 611.60 = 315.57 : x
  2. Step 2: Convert to fraction form
    406.83/611.60 = 315.57/x
  3. Step 3: Cross multiply
    406.83x = 611.60 × 315.57
  4. Step 4: Simplify right side
    406.83x = 193,001.03
  5. Step 5: Solve for x
    x = 193,001.03/406.83
  6. Step 6: Final answer
    x = 474.40

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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.