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Finding the Fourth Proportional to 1,111.73, 1,666.07 and 917.93

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Solution

The fourth proportional to 1,111.73, 1,666.07 and 917.93 is: 1,375.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,111.73 : 1,666.07 = 917.93 : x
  2. Step 2: Convert to fraction form
    1,111.73/1,666.07 = 917.93/x
  3. Step 3: Cross multiply
    1,111.73x = 1,666.07 × 917.93
  4. Step 4: Simplify right side
    1,111.73x = 1,529,338.65
  5. Step 5: Solve for x
    x = 1,529,338.65/1,111.73
  6. Step 6: Final answer
    x = 1,375.64

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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.