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Finding the Fourth Proportional to 818.39, 1,129.38 and 486.85

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Solution

The fourth proportional to 818.39, 1,129.38 and 486.85 is: 671.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.39 : 1,129.38 = 486.85 : x
  2. Step 2: Convert to fraction form
    818.39/1,129.38 = 486.85/x
  3. Step 3: Cross multiply
    818.39x = 1,129.38 × 486.85
  4. Step 4: Simplify right side
    818.39x = 549,833.01
  5. Step 5: Solve for x
    x = 549,833.01/818.39
  6. Step 6: Final answer
    x = 671.85

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Half scale
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Double scale
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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.