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Finding the Fourth Proportional to 383.40, 529.08 and 208.74

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Solution

The fourth proportional to 383.40, 529.08 and 208.74 is: 288.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    383.40 : 529.08 = 208.74 : x
  2. Step 2: Convert to fraction form
    383.40/529.08 = 208.74/x
  3. Step 3: Cross multiply
    383.40x = 529.08 × 208.74
  4. Step 4: Simplify right side
    383.40x = 110,440.16
  5. Step 5: Solve for x
    x = 110,440.16/383.40
  6. Step 6: Final answer
    x = 288.05

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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.