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Finding the Fourth Proportional to 909.66, 1,255.26 and 661.29

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Solution

The fourth proportional to 909.66, 1,255.26 and 661.29 is: 912.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.66 : 1,255.26 = 661.29 : x
  2. Step 2: Convert to fraction form
    909.66/1,255.26 = 661.29/x
  3. Step 3: Cross multiply
    909.66x = 1,255.26 × 661.29
  4. Step 4: Simplify right side
    909.66x = 830,090.89
  5. Step 5: Solve for x
    x = 830,090.89/909.66
  6. Step 6: Final answer
    x = 912.53

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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.