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Finding the Fourth Proportional to 885.62, 1,222.20 and 492.65

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Solution

The fourth proportional to 885.62, 1,222.20 and 492.65 is: 679.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.62 : 1,222.20 = 492.65 : x
  2. Step 2: Convert to fraction form
    885.62/1,222.20 = 492.65/x
  3. Step 3: Cross multiply
    885.62x = 1,222.20 × 492.65
  4. Step 4: Simplify right side
    885.62x = 602,108.26
  5. Step 5: Solve for x
    x = 602,108.26/885.62
  6. Step 6: Final answer
    x = 679.87

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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.