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Finding the Fourth Proportional to 771.88, 1,063.32 and 647.54

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Solution

The fourth proportional to 771.88, 1,063.32 and 647.54 is: 892.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.88 : 1,063.32 = 647.54 : x
  2. Step 2: Convert to fraction form
    771.88/1,063.32 = 647.54/x
  3. Step 3: Cross multiply
    771.88x = 1,063.32 × 647.54
  4. Step 4: Simplify right side
    771.88x = 688,542.23
  5. Step 5: Solve for x
    x = 688,542.23/771.88
  6. Step 6: Final answer
    x = 892.03

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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.