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Finding the Fourth Proportional to 890.75, 1,341.31 and 661.27

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Solution

The fourth proportional to 890.75, 1,341.31 and 661.27 is: 995.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.75 : 1,341.31 = 661.27 : x
  2. Step 2: Convert to fraction form
    890.75/1,341.31 = 661.27/x
  3. Step 3: Cross multiply
    890.75x = 1,341.31 × 661.27
  4. Step 4: Simplify right side
    890.75x = 886,968.06
  5. Step 5: Solve for x
    x = 886,968.06/890.75
  6. Step 6: Final answer
    x = 995.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.