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Finding the Fourth Proportional to 818.63, 1,129.92 and 553.15

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Solution

The fourth proportional to 818.63, 1,129.92 and 553.15 is: 763.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.63 : 1,129.92 = 553.15 : x
  2. Step 2: Convert to fraction form
    818.63/1,129.92 = 553.15/x
  3. Step 3: Cross multiply
    818.63x = 1,129.92 × 553.15
  4. Step 4: Simplify right side
    818.63x = 625,012.48
  5. Step 5: Solve for x
    x = 625,012.48/818.63
  6. Step 6: Final answer
    x = 763.49

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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.