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Finding the Fourth Proportional to 653.76, 902.21 and 391.77

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Solution

The fourth proportional to 653.76, 902.21 and 391.77 is: 540.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.76 : 902.21 = 391.77 : x
  2. Step 2: Convert to fraction form
    653.76/902.21 = 391.77/x
  3. Step 3: Cross multiply
    653.76x = 902.21 × 391.77
  4. Step 4: Simplify right side
    653.76x = 353,456.85
  5. Step 5: Solve for x
    x = 353,456.85/653.76
  6. Step 6: Final answer
    x = 540.65

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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.