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Finding the Fourth Proportional to 818.21, 1,127.36 and 555.77

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Solution

The fourth proportional to 818.21, 1,127.36 and 555.77 is: 765.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.21 : 1,127.36 = 555.77 : x
  2. Step 2: Convert to fraction form
    818.21/1,127.36 = 555.77/x
  3. Step 3: Cross multiply
    818.21x = 1,127.36 × 555.77
  4. Step 4: Simplify right side
    818.21x = 626,548.62
  5. Step 5: Solve for x
    x = 626,548.62/818.21
  6. Step 6: Final answer
    x = 765.76

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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.