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Finding the Fourth Proportional to 621.18, 930.56 and 490.48

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Solution

The fourth proportional to 621.18, 930.56 and 490.48 is: 734.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.18 : 930.56 = 490.48 : x
  2. Step 2: Convert to fraction form
    621.18/930.56 = 490.48/x
  3. Step 3: Cross multiply
    621.18x = 930.56 × 490.48
  4. Step 4: Simplify right side
    621.18x = 456,421.07
  5. Step 5: Solve for x
    x = 456,421.07/621.18
  6. Step 6: Final answer
    x = 734.76

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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.