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Finding the Fourth Proportional to 914.56, 1,261.12 and 681.28

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Solution

The fourth proportional to 914.56, 1,261.12 and 681.28 is: 939.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.56 : 1,261.12 = 681.28 : x
  2. Step 2: Convert to fraction form
    914.56/1,261.12 = 681.28/x
  3. Step 3: Cross multiply
    914.56x = 1,261.12 × 681.28
  4. Step 4: Simplify right side
    914.56x = 859,175.83
  5. Step 5: Solve for x
    x = 859,175.83/914.56
  6. Step 6: Final answer
    x = 939.44

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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.