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Finding the Fourth Proportional to 405.60, 608.58 and 315.09

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Solution

The fourth proportional to 405.60, 608.58 and 315.09 is: 472.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.60 : 608.58 = 315.09 : x
  2. Step 2: Convert to fraction form
    405.60/608.58 = 315.09/x
  3. Step 3: Cross multiply
    405.60x = 608.58 × 315.09
  4. Step 4: Simplify right side
    405.60x = 191,757.47
  5. Step 5: Solve for x
    x = 191,757.47/405.60
  6. Step 6: Final answer
    x = 472.77

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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.