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Finding the Fourth Proportional to 407.12, 611.08 and 261.18

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Solution

The fourth proportional to 407.12, 611.08 and 261.18 is: 392.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.12 : 611.08 = 261.18 : x
  2. Step 2: Convert to fraction form
    407.12/611.08 = 261.18/x
  3. Step 3: Cross multiply
    407.12x = 611.08 × 261.18
  4. Step 4: Simplify right side
    407.12x = 159,601.87
  5. Step 5: Solve for x
    x = 159,601.87/407.12
  6. Step 6: Final answer
    x = 392.03

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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.