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Finding the Fourth Proportional to 389.70, 581.50 and 348.68

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Solution

The fourth proportional to 389.70, 581.50 and 348.68 is: 520.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.70 : 581.50 = 348.68 : x
  2. Step 2: Convert to fraction form
    389.70/581.50 = 348.68/x
  3. Step 3: Cross multiply
    389.70x = 581.50 × 348.68
  4. Step 4: Simplify right side
    389.70x = 202,757.42
  5. Step 5: Solve for x
    x = 202,757.42/389.70
  6. Step 6: Final answer
    x = 520.29

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.