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Finding the Fourth Proportional to 818.13, 1,128.69 and 486.57

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Solution

The fourth proportional to 818.13, 1,128.69 and 486.57 is: 671.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.13 : 1,128.69 = 486.57 : x
  2. Step 2: Convert to fraction form
    818.13/1,128.69 = 486.57/x
  3. Step 3: Cross multiply
    818.13x = 1,128.69 × 486.57
  4. Step 4: Simplify right side
    818.13x = 549,186.69
  5. Step 5: Solve for x
    x = 549,186.69/818.13
  6. Step 6: Final answer
    x = 671.27

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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.