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Finding the Fourth Proportional to 383.90, 530.07 and 251.15

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Solution

The fourth proportional to 383.90, 530.07 and 251.15 is: 346.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    383.90 : 530.07 = 251.15 : x
  2. Step 2: Convert to fraction form
    383.90/530.07 = 251.15/x
  3. Step 3: Cross multiply
    383.90x = 530.07 × 251.15
  4. Step 4: Simplify right side
    383.90x = 133,128.41
  5. Step 5: Solve for x
    x = 133,128.41/383.90
  6. Step 6: Final answer
    x = 346.78

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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.