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Finding the Fourth Proportional to 818.66, 1,135.47 and 790.86

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Solution

The fourth proportional to 818.66, 1,135.47 and 790.86 is: 1,096.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.66 : 1,135.47 = 790.86 : x
  2. Step 2: Convert to fraction form
    818.66/1,135.47 = 790.86/x
  3. Step 3: Cross multiply
    818.66x = 1,135.47 × 790.86
  4. Step 4: Simplify right side
    818.66x = 898,000.58
  5. Step 5: Solve for x
    x = 898,000.58/818.66
  6. Step 6: Final answer
    x = 1,096.92

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.