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Finding the Fourth Proportional to 1,107.86, 1,665.44 and 925.61

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Solution

The fourth proportional to 1,107.86, 1,665.44 and 925.61 is: 1,391.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,107.86 : 1,665.44 = 925.61 : x
  2. Step 2: Convert to fraction form
    1,107.86/1,665.44 = 925.61/x
  3. Step 3: Cross multiply
    1,107.86x = 1,665.44 × 925.61
  4. Step 4: Simplify right side
    1,107.86x = 1,541,547.92
  5. Step 5: Solve for x
    x = 1,541,547.92/1,107.86
  6. Step 6: Final answer
    x = 1,391.46

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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.