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Finding the Fourth Proportional to 628.96, 868.30 and 488.77

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Solution

The fourth proportional to 628.96, 868.30 and 488.77 is: 674.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.96 : 868.30 = 488.77 : x
  2. Step 2: Convert to fraction form
    628.96/868.30 = 488.77/x
  3. Step 3: Cross multiply
    628.96x = 868.30 × 488.77
  4. Step 4: Simplify right side
    628.96x = 424,398.99
  5. Step 5: Solve for x
    x = 424,398.99/628.96
  6. Step 6: Final answer
    x = 674.76

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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.