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Finding the Fourth Proportional to 390.08, 582.08 and 355.58

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Solution

The fourth proportional to 390.08, 582.08 and 355.58 is: 530.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.08 : 582.08 = 355.58 : x
  2. Step 2: Convert to fraction form
    390.08/582.08 = 355.58/x
  3. Step 3: Cross multiply
    390.08x = 582.08 × 355.58
  4. Step 4: Simplify right side
    390.08x = 206,976.01
  5. Step 5: Solve for x
    x = 206,976.01/390.08
  6. Step 6: Final answer
    x = 530.60

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.