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Finding the Fourth Proportional to 407.25, 611.78 and 245.05

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Solution

The fourth proportional to 407.25, 611.78 and 245.05 is: 368.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.25 : 611.78 = 245.05 : x
  2. Step 2: Convert to fraction form
    407.25/611.78 = 245.05/x
  3. Step 3: Cross multiply
    407.25x = 611.78 × 245.05
  4. Step 4: Simplify right side
    407.25x = 149,915.77
  5. Step 5: Solve for x
    x = 149,915.77/407.25
  6. Step 6: Final answer
    x = 368.12

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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.