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Finding the Fourth Proportional to 839.51, 1,256.09 and 754.25

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Solution

The fourth proportional to 839.51, 1,256.09 and 754.25 is: 1,128.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.51 : 1,256.09 = 754.25 : x
  2. Step 2: Convert to fraction form
    839.51/1,256.09 = 754.25/x
  3. Step 3: Cross multiply
    839.51x = 1,256.09 × 754.25
  4. Step 4: Simplify right side
    839.51x = 947,401.49
  5. Step 5: Solve for x
    x = 947,401.49/839.51
  6. Step 6: Final answer
    x = 1,128.52

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.