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Finding the Fourth Proportional to 471.15, 649.96 and 305.51

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Solution

The fourth proportional to 471.15, 649.96 and 305.51 is: 421.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    471.15 : 649.96 = 305.51 : x
  2. Step 2: Convert to fraction form
    471.15/649.96 = 305.51/x
  3. Step 3: Cross multiply
    471.15x = 649.96 × 305.51
  4. Step 4: Simplify right side
    471.15x = 198,565.27
  5. Step 5: Solve for x
    x = 198,565.27/471.15
  6. Step 6: Final answer
    x = 421.45

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.