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Finding the Fourth Proportional to 644.61, 889.61 and 486.96

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Solution

The fourth proportional to 644.61, 889.61 and 486.96 is: 672.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.61 : 889.61 = 486.96 : x
  2. Step 2: Convert to fraction form
    644.61/889.61 = 486.96/x
  3. Step 3: Cross multiply
    644.61x = 889.61 × 486.96
  4. Step 4: Simplify right side
    644.61x = 433,207.59
  5. Step 5: Solve for x
    x = 433,207.59/644.61
  6. Step 6: Final answer
    x = 672.05

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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.