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Finding the Fourth Proportional to 756.88, 1,043.81 and 491.06

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Solution

The fourth proportional to 756.88, 1,043.81 and 491.06 is: 677.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.88 : 1,043.81 = 491.06 : x
  2. Step 2: Convert to fraction form
    756.88/1,043.81 = 491.06/x
  3. Step 3: Cross multiply
    756.88x = 1,043.81 × 491.06
  4. Step 4: Simplify right side
    756.88x = 512,573.34
  5. Step 5: Solve for x
    x = 512,573.34/756.88
  6. Step 6: Final answer
    x = 677.22

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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.