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Finding the Fourth Proportional to 390.56, 585.14 and 348.18

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Solution

The fourth proportional to 390.56, 585.14 and 348.18 is: 521.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.56 : 585.14 = 348.18 : x
  2. Step 2: Convert to fraction form
    390.56/585.14 = 348.18/x
  3. Step 3: Cross multiply
    390.56x = 585.14 × 348.18
  4. Step 4: Simplify right side
    390.56x = 203,735.36
  5. Step 5: Solve for x
    x = 203,735.36/390.56
  6. Step 6: Final answer
    x = 521.66

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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.