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Finding the Fourth Proportional to 390.34, 582.46 and 355.84

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Solution

The fourth proportional to 390.34, 582.46 and 355.84 is: 530.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.34 : 582.46 = 355.84 : x
  2. Step 2: Convert to fraction form
    390.34/582.46 = 355.84/x
  3. Step 3: Cross multiply
    390.34x = 582.46 × 355.84
  4. Step 4: Simplify right side
    390.34x = 207,262.57
  5. Step 5: Solve for x
    x = 207,262.57/390.34
  6. Step 6: Final answer
    x = 530.98

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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.