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Finding the Fourth Proportional to 385.73, 531.83 and 315.63

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Solution

The fourth proportional to 385.73, 531.83 and 315.63 is: 435.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.73 : 531.83 = 315.63 : x
  2. Step 2: Convert to fraction form
    385.73/531.83 = 315.63/x
  3. Step 3: Cross multiply
    385.73x = 531.83 × 315.63
  4. Step 4: Simplify right side
    385.73x = 167,859.92
  5. Step 5: Solve for x
    x = 167,859.92/385.73
  6. Step 6: Final answer
    x = 435.18

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.