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Finding the Fourth Proportional to 818.34, 1,129.55 and 608.73

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Solution

The fourth proportional to 818.34, 1,129.55 and 608.73 is: 840.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.34 : 1,129.55 = 608.73 : x
  2. Step 2: Convert to fraction form
    818.34/1,129.55 = 608.73/x
  3. Step 3: Cross multiply
    818.34x = 1,129.55 × 608.73
  4. Step 4: Simplify right side
    818.34x = 687,587.93
  5. Step 5: Solve for x
    x = 687,587.93/818.34
  6. Step 6: Final answer
    x = 840.22

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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.