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Finding the Fourth Proportional to 383.39, 529.10 and 215.35

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Solution

The fourth proportional to 383.39, 529.10 and 215.35 is: 297.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    383.39 : 529.10 = 215.35 : x
  2. Step 2: Convert to fraction form
    383.39/529.10 = 215.35/x
  3. Step 3: Cross multiply
    383.39x = 529.10 × 215.35
  4. Step 4: Simplify right side
    383.39x = 113,941.69
  5. Step 5: Solve for x
    x = 113,941.69/383.39
  6. Step 6: Final answer
    x = 297.20

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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.