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Finding the Fourth Proportional to 754.10, 1,039.71 and 648.98

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Solution

The fourth proportional to 754.10, 1,039.71 and 648.98 is: 894.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.10 : 1,039.71 = 648.98 : x
  2. Step 2: Convert to fraction form
    754.10/1,039.71 = 648.98/x
  3. Step 3: Cross multiply
    754.10x = 1,039.71 × 648.98
  4. Step 4: Simplify right side
    754.10x = 674,751.00
  5. Step 5: Solve for x
    x = 674,751.00/754.10
  6. Step 6: Final answer
    x = 894.78

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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.