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Finding the Fourth Proportional to 818.42, 1,128.93 and 763.74

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Solution

The fourth proportional to 818.42, 1,128.93 and 763.74 is: 1,053.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.42 : 1,128.93 = 763.74 : x
  2. Step 2: Convert to fraction form
    818.42/1,128.93 = 763.74/x
  3. Step 3: Cross multiply
    818.42x = 1,128.93 × 763.74
  4. Step 4: Simplify right side
    818.42x = 862,209.00
  5. Step 5: Solve for x
    x = 862,209.00/818.42
  6. Step 6: Final answer
    x = 1,053.51

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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.