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Finding the Fourth Proportional to 407.78, 610.86 and 316.16

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Solution

The fourth proportional to 407.78, 610.86 and 316.16 is: 473.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.78 : 610.86 = 316.16 : x
  2. Step 2: Convert to fraction form
    407.78/610.86 = 316.16/x
  3. Step 3: Cross multiply
    407.78x = 610.86 × 316.16
  4. Step 4: Simplify right side
    407.78x = 193,129.50
  5. Step 5: Solve for x
    x = 193,129.50/407.78
  6. Step 6: Final answer
    x = 473.61

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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.