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Finding the Fourth Proportional to 644.48, 887.52 and 613.76

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Solution

The fourth proportional to 644.48, 887.52 and 613.76 is: 845.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.48 : 887.52 = 613.76 : x
  2. Step 2: Convert to fraction form
    644.48/887.52 = 613.76/x
  3. Step 3: Cross multiply
    644.48x = 887.52 × 613.76
  4. Step 4: Simplify right side
    644.48x = 544,724.28
  5. Step 5: Solve for x
    x = 544,724.28/644.48
  6. Step 6: Final answer
    x = 845.22

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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.