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Finding the Fourth Proportional to 316.86, 474.55 and 305.91

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Solution

The fourth proportional to 316.86, 474.55 and 305.91 is: 458.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.86 : 474.55 = 305.91 : x
  2. Step 2: Convert to fraction form
    316.86/474.55 = 305.91/x
  3. Step 3: Cross multiply
    316.86x = 474.55 × 305.91
  4. Step 4: Simplify right side
    316.86x = 145,169.59
  5. Step 5: Solve for x
    x = 145,169.59/316.86
  6. Step 6: Final answer
    x = 458.15

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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.