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Finding the Fourth Proportional to 817.90, 1,128.84 and 486.44

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Solution

The fourth proportional to 817.90, 1,128.84 and 486.44 is: 671.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.90 : 1,128.84 = 486.44 : x
  2. Step 2: Convert to fraction form
    817.90/1,128.84 = 486.44/x
  3. Step 3: Cross multiply
    817.90x = 1,128.84 × 486.44
  4. Step 4: Simplify right side
    817.90x = 549,109.69
  5. Step 5: Solve for x
    x = 549,109.69/817.90
  6. Step 6: Final answer
    x = 671.37

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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.