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Finding the Fourth Proportional to 469.56, 649.26 and 391.80

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Solution

The fourth proportional to 469.56, 649.26 and 391.80 is: 541.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    469.56 : 649.26 = 391.80 : x
  2. Step 2: Convert to fraction form
    469.56/649.26 = 391.80/x
  3. Step 3: Cross multiply
    469.56x = 649.26 × 391.80
  4. Step 4: Simplify right side
    469.56x = 254,380.07
  5. Step 5: Solve for x
    x = 254,380.07/469.56
  6. Step 6: Final answer
    x = 541.74

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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.