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Finding the Fourth Proportional to 900, 1,242.14 and 550.90

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Solution

The fourth proportional to 900, 1,242.14 and 550.90 is: 760.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    900 : 1,242.14 = 550.90 : x
  2. Step 2: Convert to fraction form
    900/1,242.14 = 550.90/x
  3. Step 3: Cross multiply
    900x = 1,242.14 × 550.90
  4. Step 4: Simplify right side
    900x = 684,294.93
  5. Step 5: Solve for x
    x = 684,294.93/900
  6. Step 6: Final answer
    x = 760.33

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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.