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Finding the Fourth Proportional to 653.15, 979.11 and 447.81

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Solution

The fourth proportional to 653.15, 979.11 and 447.81 is: 671.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.15 : 979.11 = 447.81 : x
  2. Step 2: Convert to fraction form
    653.15/979.11 = 447.81/x
  3. Step 3: Cross multiply
    653.15x = 979.11 × 447.81
  4. Step 4: Simplify right side
    653.15x = 438,455.25
  5. Step 5: Solve for x
    x = 438,455.25/653.15
  6. Step 6: Final answer
    x = 671.30

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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.