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Finding the Fourth Proportional to 389.45, 584.30 and 266.58

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Solution

The fourth proportional to 389.45, 584.30 and 266.58 is: 399.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.45 : 584.30 = 266.58 : x
  2. Step 2: Convert to fraction form
    389.45/584.30 = 266.58/x
  3. Step 3: Cross multiply
    389.45x = 584.30 × 266.58
  4. Step 4: Simplify right side
    389.45x = 155,763.36
  5. Step 5: Solve for x
    x = 155,763.36/389.45
  6. Step 6: Final answer
    x = 399.95

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.