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Finding the Fourth Proportional to 886.96, 1,224.60 and 690.16

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Solution

The fourth proportional to 886.96, 1,224.60 and 690.16 is: 952.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.96 : 1,224.60 = 690.16 : x
  2. Step 2: Convert to fraction form
    886.96/1,224.60 = 690.16/x
  3. Step 3: Cross multiply
    886.96x = 1,224.60 × 690.16
  4. Step 4: Simplify right side
    886.96x = 845,169.94
  5. Step 5: Solve for x
    x = 845,169.94/886.96
  6. Step 6: Final answer
    x = 952.88

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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.