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Finding the Fourth Proportional to 818.84, 1,129.85 and 553.57

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Solution

The fourth proportional to 818.84, 1,129.85 and 553.57 is: 763.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.84 : 1,129.85 = 553.57 : x
  2. Step 2: Convert to fraction form
    818.84/1,129.85 = 553.57/x
  3. Step 3: Cross multiply
    818.84x = 1,129.85 × 553.57
  4. Step 4: Simplify right side
    818.84x = 625,447.55
  5. Step 5: Solve for x
    x = 625,447.55/818.84
  6. Step 6: Final answer
    x = 763.82

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1.5x scale

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.