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Finding the Fourth Proportional to 885.03, 1,221.42 and 663.60

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Solution

The fourth proportional to 885.03, 1,221.42 and 663.60 is: 915.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.03 : 1,221.42 = 663.60 : x
  2. Step 2: Convert to fraction form
    885.03/1,221.42 = 663.60/x
  3. Step 3: Cross multiply
    885.03x = 1,221.42 × 663.60
  4. Step 4: Simplify right side
    885.03x = 810,534.31
  5. Step 5: Solve for x
    x = 810,534.31/885.03
  6. Step 6: Final answer
    x = 915.83

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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.