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Finding the Fourth Proportional to 411.76, 616.64 and 319.68

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Solution

The fourth proportional to 411.76, 616.64 and 319.68 is: 478.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.76 : 616.64 = 319.68 : x
  2. Step 2: Convert to fraction form
    411.76/616.64 = 319.68/x
  3. Step 3: Cross multiply
    411.76x = 616.64 × 319.68
  4. Step 4: Simplify right side
    411.76x = 197,127.48
  5. Step 5: Solve for x
    x = 197,127.48/411.76
  6. Step 6: Final answer
    x = 478.74

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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.