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Finding the Fourth Proportional to 818.78, 1,128.97 and 652.86

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Solution

The fourth proportional to 818.78, 1,128.97 and 652.86 is: 900.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.78 : 1,128.97 = 652.86 : x
  2. Step 2: Convert to fraction form
    818.78/1,128.97 = 652.86/x
  3. Step 3: Cross multiply
    818.78x = 1,128.97 × 652.86
  4. Step 4: Simplify right side
    818.78x = 737,056.09
  5. Step 5: Solve for x
    x = 737,056.09/818.78
  6. Step 6: Final answer
    x = 900.19

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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.