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Finding the Fourth Proportional to 406.88, 611.55 and 309.68

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Solution

The fourth proportional to 406.88, 611.55 and 309.68 is: 465.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.88 : 611.55 = 309.68 : x
  2. Step 2: Convert to fraction form
    406.88/611.55 = 309.68/x
  3. Step 3: Cross multiply
    406.88x = 611.55 × 309.68
  4. Step 4: Simplify right side
    406.88x = 189,384.80
  5. Step 5: Solve for x
    x = 189,384.80/406.88
  6. Step 6: Final answer
    x = 465.46

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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.