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Finding the Fourth Proportional to 1,090.35, 1,633.25 and 858.13

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Solution

The fourth proportional to 1,090.35, 1,633.25 and 858.13 is: 1,285.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,090.35 : 1,633.25 = 858.13 : x
  2. Step 2: Convert to fraction form
    1,090.35/1,633.25 = 858.13/x
  3. Step 3: Cross multiply
    1,090.35x = 1,633.25 × 858.13
  4. Step 4: Simplify right side
    1,090.35x = 1,401,538.88
  5. Step 5: Solve for x
    x = 1,401,538.88/1,090.35
  6. Step 6: Final answer
    x = 1,285.40

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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.