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Finding the Fourth Proportional to 1,055.75, 1,455.75 and 682.25

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Solution

The fourth proportional to 1,055.75, 1,455.75 and 682.25 is: 940.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,055.75 : 1,455.75 = 682.25 : x
  2. Step 2: Convert to fraction form
    1,055.75/1,455.75 = 682.25/x
  3. Step 3: Cross multiply
    1,055.75x = 1,455.75 × 682.25
  4. Step 4: Simplify right side
    1,055.75x = 993,178.16
  5. Step 5: Solve for x
    x = 993,178.16/1,055.75
  6. Step 6: Final answer
    x = 940.74

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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.