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Finding the Fourth Proportional to 1,324.20, 1,984.82 and 621.76

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Solution

The fourth proportional to 1,324.20, 1,984.82 and 621.76 is: 931.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,324.20 : 1,984.82 = 621.76 : x
  2. Step 2: Convert to fraction form
    1,324.20/1,984.82 = 621.76/x
  3. Step 3: Cross multiply
    1,324.20x = 1,984.82 × 621.76
  4. Step 4: Simplify right side
    1,324.20x = 1,234,068.65
  5. Step 5: Solve for x
    x = 1,234,068.65/1,324.20
  6. Step 6: Final answer
    x = 931.94

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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.