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Finding the Fourth Proportional to 389.75, 583.52 and 279.66

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Solution

The fourth proportional to 389.75, 583.52 and 279.66 is: 418.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.75 : 583.52 = 279.66 : x
  2. Step 2: Convert to fraction form
    389.75/583.52 = 279.66/x
  3. Step 3: Cross multiply
    389.75x = 583.52 × 279.66
  4. Step 4: Simplify right side
    389.75x = 163,187.99
  5. Step 5: Solve for x
    x = 163,187.99/389.75
  6. Step 6: Final answer
    x = 418.70

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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.