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Finding the Fourth Proportional to 621.18, 930.74 and 437.72

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Solution

The fourth proportional to 621.18, 930.74 and 437.72 is: 655.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.18 : 930.74 = 437.72 : x
  2. Step 2: Convert to fraction form
    621.18/930.74 = 437.72/x
  3. Step 3: Cross multiply
    621.18x = 930.74 × 437.72
  4. Step 4: Simplify right side
    621.18x = 407,396.67
  5. Step 5: Solve for x
    x = 407,396.67/621.18
  6. Step 6: Final answer
    x = 655.84

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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.