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Finding the Fourth Proportional to 845.12, 1,165.88 and 486

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Solution

The fourth proportional to 845.12, 1,165.88 and 486 is: 670.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    845.12 : 1,165.88 = 486 : x
  2. Step 2: Convert to fraction form
    845.12/1,165.88 = 486/x
  3. Step 3: Cross multiply
    845.12x = 1,165.88 × 486
  4. Step 4: Simplify right side
    845.12x = 566,617.68
  5. Step 5: Solve for x
    x = 566,617.68/845.12
  6. Step 6: Final answer
    x = 670.46

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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.