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Finding the Fourth Proportional to 885.15, 1,221.51 and 492.15

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Solution

The fourth proportional to 885.15, 1,221.51 and 492.15 is: 679.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.15 : 1,221.51 = 492.15 : x
  2. Step 2: Convert to fraction form
    885.15/1,221.51 = 492.15/x
  3. Step 3: Cross multiply
    885.15x = 1,221.51 × 492.15
  4. Step 4: Simplify right side
    885.15x = 601,166.15
  5. Step 5: Solve for x
    x = 601,166.15/885.15
  6. Step 6: Final answer
    x = 679.17

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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.