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Finding the Fourth Proportional to 407.86, 612.40 and 234.72

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Solution

The fourth proportional to 407.86, 612.40 and 234.72 is: 352.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.86 : 612.40 = 234.72 : x
  2. Step 2: Convert to fraction form
    407.86/612.40 = 234.72/x
  3. Step 3: Cross multiply
    407.86x = 612.40 × 234.72
  4. Step 4: Simplify right side
    407.86x = 143,741.94
  5. Step 5: Solve for x
    x = 143,741.94/407.86
  6. Step 6: Final answer
    x = 352.43

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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.