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Finding the Fourth Proportional to 818.52, 1,129.20 and 486.78

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Solution

The fourth proportional to 818.52, 1,129.20 and 486.78 is: 671.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.52 : 1,129.20 = 486.78 : x
  2. Step 2: Convert to fraction form
    818.52/1,129.20 = 486.78/x
  3. Step 3: Cross multiply
    818.52x = 1,129.20 × 486.78
  4. Step 4: Simplify right side
    818.52x = 549,671.98
  5. Step 5: Solve for x
    x = 549,671.98/818.52
  6. Step 6: Final answer
    x = 671.54

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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.