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Finding the Fourth Proportional to 407.60, 611.29 and 115.08

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Solution

The fourth proportional to 407.60, 611.29 and 115.08 is: 172.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.60 : 611.29 = 115.08 : x
  2. Step 2: Convert to fraction form
    407.60/611.29 = 115.08/x
  3. Step 3: Cross multiply
    407.60x = 611.29 × 115.08
  4. Step 4: Simplify right side
    407.60x = 70,348.49
  5. Step 5: Solve for x
    x = 70,348.49/407.60
  6. Step 6: Final answer
    x = 172.59

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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.