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Finding the Fourth Proportional to 630.48, 869.61 and 486.23

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Solution

The fourth proportional to 630.48, 869.61 and 486.23 is: 670.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.48 : 869.61 = 486.23 : x
  2. Step 2: Convert to fraction form
    630.48/869.61 = 486.23/x
  3. Step 3: Cross multiply
    630.48x = 869.61 × 486.23
  4. Step 4: Simplify right side
    630.48x = 422,826.73
  5. Step 5: Solve for x
    x = 422,826.73/630.48
  6. Step 6: Final answer
    x = 670.64

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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.