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Finding the Fourth Proportional to 1,449.68, 1,999.81 and 917.66

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Solution

The fourth proportional to 1,449.68, 1,999.81 and 917.66 is: 1,265.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,449.68 : 1,999.81 = 917.66 : x
  2. Step 2: Convert to fraction form
    1,449.68/1,999.81 = 917.66/x
  3. Step 3: Cross multiply
    1,449.68x = 1,999.81 × 917.66
  4. Step 4: Simplify right side
    1,449.68x = 1,835,133.35
  5. Step 5: Solve for x
    x = 1,835,133.35/1,449.68
  6. Step 6: Final answer
    x = 1,265.89

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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.