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Finding the Fourth Proportional to 818.03, 1,129.14 and 556.20

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Solution

The fourth proportional to 818.03, 1,129.14 and 556.20 is: 767.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.03 : 1,129.14 = 556.20 : x
  2. Step 2: Convert to fraction form
    818.03/1,129.14 = 556.20/x
  3. Step 3: Cross multiply
    818.03x = 1,129.14 × 556.20
  4. Step 4: Simplify right side
    818.03x = 628,027.67
  5. Step 5: Solve for x
    x = 628,027.67/818.03
  6. Step 6: Final answer
    x = 767.73

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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.