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Finding the Fourth Proportional to 885.18, 1,221.58 and 486.86

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Solution

The fourth proportional to 885.18, 1,221.58 and 486.86 is: 671.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.18 : 1,221.58 = 486.86 : x
  2. Step 2: Convert to fraction form
    885.18/1,221.58 = 486.86/x
  3. Step 3: Cross multiply
    885.18x = 1,221.58 × 486.86
  4. Step 4: Simplify right side
    885.18x = 594,735.47
  5. Step 5: Solve for x
    x = 594,735.47/885.18
  6. Step 6: Final answer
    x = 671.88

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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.