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Finding the Fourth Proportional to 797.76, 1,100.16 and 687.36

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Solution

The fourth proportional to 797.76, 1,100.16 and 687.36 is: 947.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    797.76 : 1,100.16 = 687.36 : x
  2. Step 2: Convert to fraction form
    797.76/1,100.16 = 687.36/x
  3. Step 3: Cross multiply
    797.76x = 1,100.16 × 687.36
  4. Step 4: Simplify right side
    797.76x = 756,205.98
  5. Step 5: Solve for x
    x = 756,205.98/797.76
  6. Step 6: Final answer
    x = 947.91

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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.