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Finding the Fourth Proportional to 621.80, 931.20 and 332.60

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Solution

The fourth proportional to 621.80, 931.20 and 332.60 is: 498.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.80 : 931.20 = 332.60 : x
  2. Step 2: Convert to fraction form
    621.80/931.20 = 332.60/x
  3. Step 3: Cross multiply
    621.80x = 931.20 × 332.60
  4. Step 4: Simplify right side
    621.80x = 309,717.12
  5. Step 5: Solve for x
    x = 309,717.12/621.80
  6. Step 6: Final answer
    x = 498.10

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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.