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Finding the Fourth Proportional to 619.81, 929.93 and 447.57

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Solution

The fourth proportional to 619.81, 929.93 and 447.57 is: 671.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.81 : 929.93 = 447.57 : x
  2. Step 2: Convert to fraction form
    619.81/929.93 = 447.57/x
  3. Step 3: Cross multiply
    619.81x = 929.93 × 447.57
  4. Step 4: Simplify right side
    619.81x = 416,206.53
  5. Step 5: Solve for x
    x = 416,206.53/619.81
  6. Step 6: Final answer
    x = 671.51

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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.