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Finding the Fourth Proportional to 389.44, 581.16 and 347.87

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Solution

The fourth proportional to 389.44, 581.16 and 347.87 is: 519.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.44 : 581.16 = 347.87 : x
  2. Step 2: Convert to fraction form
    389.44/581.16 = 347.87/x
  3. Step 3: Cross multiply
    389.44x = 581.16 × 347.87
  4. Step 4: Simplify right side
    389.44x = 202,170.89
  5. Step 5: Solve for x
    x = 202,170.89/389.44
  6. Step 6: Final answer
    x = 519.13

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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.