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Finding the Fourth Proportional to 411.60, 618.60 and 358.80

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Solution

The fourth proportional to 411.60, 618.60 and 358.80 is: 539.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.60 : 618.60 = 358.80 : x
  2. Step 2: Convert to fraction form
    411.60/618.60 = 358.80/x
  3. Step 3: Cross multiply
    411.60x = 618.60 × 358.80
  4. Step 4: Simplify right side
    411.60x = 221,953.68
  5. Step 5: Solve for x
    x = 221,953.68/411.60
  6. Step 6: Final answer
    x = 539.25

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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.