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Finding the Fourth Proportional to 798.74, 1,100.05 and 688.17

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Solution

The fourth proportional to 798.74, 1,100.05 and 688.17 is: 947.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    798.74 : 1,100.05 = 688.17 : x
  2. Step 2: Convert to fraction form
    798.74/1,100.05 = 688.17/x
  3. Step 3: Cross multiply
    798.74x = 1,100.05 × 688.17
  4. Step 4: Simplify right side
    798.74x = 757,021.41
  5. Step 5: Solve for x
    x = 757,021.41/798.74
  6. Step 6: Final answer
    x = 947.77

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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.