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Finding the Fourth Proportional to 405.04, 557.68 and 355.68

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Solution

The fourth proportional to 405.04, 557.68 and 355.68 is: 489.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.04 : 557.68 = 355.68 : x
  2. Step 2: Convert to fraction form
    405.04/557.68 = 355.68/x
  3. Step 3: Cross multiply
    405.04x = 557.68 × 355.68
  4. Step 4: Simplify right side
    405.04x = 198,355.62
  5. Step 5: Solve for x
    x = 198,355.62/405.04
  6. Step 6: Final answer
    x = 489.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.