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Finding the Fourth Proportional to 644.70, 888.38 and 528.06

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Solution

The fourth proportional to 644.70, 888.38 and 528.06 is: 727.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.70 : 888.38 = 528.06 : x
  2. Step 2: Convert to fraction form
    644.70/888.38 = 528.06/x
  3. Step 3: Cross multiply
    644.70x = 888.38 × 528.06
  4. Step 4: Simplify right side
    644.70x = 469,117.94
  5. Step 5: Solve for x
    x = 469,117.94/644.70
  6. Step 6: Final answer
    x = 727.65

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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.