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Finding the Fourth Proportional to 885.07, 1,221.40 and 492.09

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Solution

The fourth proportional to 885.07, 1,221.40 and 492.09 is: 679.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.07 : 1,221.40 = 492.09 : x
  2. Step 2: Convert to fraction form
    885.07/1,221.40 = 492.09/x
  3. Step 3: Cross multiply
    885.07x = 1,221.40 × 492.09
  4. Step 4: Simplify right side
    885.07x = 601,043.92
  5. Step 5: Solve for x
    x = 601,043.92/885.07
  6. Step 6: Final answer
    x = 679.09

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1.5x scale

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.