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Finding the Fourth Proportional to 389.40, 581.24 and 356.94

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Solution

The fourth proportional to 389.40, 581.24 and 356.94 is: 532.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.40 : 581.24 = 356.94 : x
  2. Step 2: Convert to fraction form
    389.40/581.24 = 356.94/x
  3. Step 3: Cross multiply
    389.40x = 581.24 × 356.94
  4. Step 4: Simplify right side
    389.40x = 207,467.81
  5. Step 5: Solve for x
    x = 207,467.81/389.40
  6. Step 6: Final answer
    x = 532.79

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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.