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Finding the Fourth Proportional to 390.25, 585.39 and 101.69

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Solution

The fourth proportional to 390.25, 585.39 and 101.69 is: 152.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.25 : 585.39 = 101.69 : x
  2. Step 2: Convert to fraction form
    390.25/585.39 = 101.69/x
  3. Step 3: Cross multiply
    390.25x = 585.39 × 101.69
  4. Step 4: Simplify right side
    390.25x = 59,528.31
  5. Step 5: Solve for x
    x = 59,528.31/390.25
  6. Step 6: Final answer
    x = 152.54

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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.