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Finding the Fourth Proportional to 405.92, 607.92 and 320.48

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Solution

The fourth proportional to 405.92, 607.92 and 320.48 is: 479.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.92 : 607.92 = 320.48 : x
  2. Step 2: Convert to fraction form
    405.92/607.92 = 320.48/x
  3. Step 3: Cross multiply
    405.92x = 607.92 × 320.48
  4. Step 4: Simplify right side
    405.92x = 194,826.20
  5. Step 5: Solve for x
    x = 194,826.20/405.92
  6. Step 6: Final answer
    x = 479.96

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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.