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Finding the Fourth Proportional to 818.25, 1,129.10 and 486.62

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Solution

The fourth proportional to 818.25, 1,129.10 and 486.62 is: 671.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.25 : 1,129.10 = 486.62 : x
  2. Step 2: Convert to fraction form
    818.25/1,129.10 = 486.62/x
  3. Step 3: Cross multiply
    818.25x = 1,129.10 × 486.62
  4. Step 4: Simplify right side
    818.25x = 549,442.64
  5. Step 5: Solve for x
    x = 549,442.64/818.25
  6. Step 6: Final answer
    x = 671.49

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Double scale
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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.