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Finding the Fourth Proportional to 1,095.42, 1,639.27 and 684.75

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Solution

The fourth proportional to 1,095.42, 1,639.27 and 684.75 is: 1,024.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,095.42 : 1,639.27 = 684.75 : x
  2. Step 2: Convert to fraction form
    1,095.42/1,639.27 = 684.75/x
  3. Step 3: Cross multiply
    1,095.42x = 1,639.27 × 684.75
  4. Step 4: Simplify right side
    1,095.42x = 1,122,490.13
  5. Step 5: Solve for x
    x = 1,122,490.13/1,095.42
  6. Step 6: Final answer
    x = 1,024.71

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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.