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Finding the Fourth Proportional to 818.46, 1,129.38 and 486.83

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Solution

The fourth proportional to 818.46, 1,129.38 and 486.83 is: 671.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.46 : 1,129.38 = 486.83 : x
  2. Step 2: Convert to fraction form
    818.46/1,129.38 = 486.83/x
  3. Step 3: Cross multiply
    818.46x = 1,129.38 × 486.83
  4. Step 4: Simplify right side
    818.46x = 549,810.42
  5. Step 5: Solve for x
    x = 549,810.42/818.46
  6. Step 6: Final answer
    x = 671.76

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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.