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Finding the Fourth Proportional to 484.61, 669.18 and 391.86

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Solution

The fourth proportional to 484.61, 669.18 and 391.86 is: 541.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    484.61 : 669.18 = 391.86 : x
  2. Step 2: Convert to fraction form
    484.61/669.18 = 391.86/x
  3. Step 3: Cross multiply
    484.61x = 669.18 × 391.86
  4. Step 4: Simplify right side
    484.61x = 262,224.87
  5. Step 5: Solve for x
    x = 262,224.87/484.61
  6. Step 6: Final answer
    x = 541.11

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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.