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Finding the Fourth Proportional to 885.12, 1,221.32 and 492.08

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Solution

The fourth proportional to 885.12, 1,221.32 and 492.08 is: 678.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.12 : 1,221.32 = 492.08 : x
  2. Step 2: Convert to fraction form
    885.12/1,221.32 = 492.08/x
  3. Step 3: Cross multiply
    885.12x = 1,221.32 × 492.08
  4. Step 4: Simplify right side
    885.12x = 600,987.15
  5. Step 5: Solve for x
    x = 600,987.15/885.12
  6. Step 6: Final answer
    x = 678.99

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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.