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Finding the Fourth Proportional to 318.53, 438.66 and 317.60

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Solution

The fourth proportional to 318.53, 438.66 and 317.60 is: 437.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.53 : 438.66 = 317.60 : x
  2. Step 2: Convert to fraction form
    318.53/438.66 = 317.60/x
  3. Step 3: Cross multiply
    318.53x = 438.66 × 317.60
  4. Step 4: Simplify right side
    318.53x = 139,318.42
  5. Step 5: Solve for x
    x = 139,318.42/318.53
  6. Step 6: Final answer
    x = 437.38

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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.