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Finding the Fourth Proportional to 390.88, 585.84 and 282.56

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Solution

The fourth proportional to 390.88, 585.84 and 282.56 is: 423.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.88 : 585.84 = 282.56 : x
  2. Step 2: Convert to fraction form
    390.88/585.84 = 282.56/x
  3. Step 3: Cross multiply
    390.88x = 585.84 × 282.56
  4. Step 4: Simplify right side
    390.88x = 165,534.95
  5. Step 5: Solve for x
    x = 165,534.95/390.88
  6. Step 6: Final answer
    x = 423.49

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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.