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Finding the Fourth Proportional to 383.12, 528.84 and 317.60

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Solution

The fourth proportional to 383.12, 528.84 and 317.60 is: 438.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    383.12 : 528.84 = 317.60 : x
  2. Step 2: Convert to fraction form
    383.12/528.84 = 317.60/x
  3. Step 3: Cross multiply
    383.12x = 528.84 × 317.60
  4. Step 4: Simplify right side
    383.12x = 167,959.58
  5. Step 5: Solve for x
    x = 167,959.58/383.12
  6. Step 6: Final answer
    x = 438.40

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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.