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Finding the Fourth Proportional to 884.60, 1,220.94 and 553.16

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Solution

The fourth proportional to 884.60, 1,220.94 and 553.16 is: 763.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    884.60 : 1,220.94 = 553.16 : x
  2. Step 2: Convert to fraction form
    884.60/1,220.94 = 553.16/x
  3. Step 3: Cross multiply
    884.60x = 1,220.94 × 553.16
  4. Step 4: Simplify right side
    884.60x = 675,375.17
  5. Step 5: Solve for x
    x = 675,375.17/884.60
  6. Step 6: Final answer
    x = 763.48

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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.