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Finding the Fourth Proportional to 1,055.21, 1,455.99 and 682.66

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Solution

The fourth proportional to 1,055.21, 1,455.99 and 682.66 is: 941.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,055.21 : 1,455.99 = 682.66 : x
  2. Step 2: Convert to fraction form
    1,055.21/1,455.99 = 682.66/x
  3. Step 3: Cross multiply
    1,055.21x = 1,455.99 × 682.66
  4. Step 4: Simplify right side
    1,055.21x = 993,938.85
  5. Step 5: Solve for x
    x = 993,938.85/1,055.21
  6. Step 6: Final answer
    x = 941.93

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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.