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Finding the Fourth Proportional to 1,095.08, 1,640.75 and 661.32

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Solution

The fourth proportional to 1,095.08, 1,640.75 and 661.32 is: 990.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,095.08 : 1,640.75 = 661.32 : x
  2. Step 2: Convert to fraction form
    1,095.08/1,640.75 = 661.32/x
  3. Step 3: Cross multiply
    1,095.08x = 1,640.75 × 661.32
  4. Step 4: Simplify right side
    1,095.08x = 1,085,057.48
  5. Step 5: Solve for x
    x = 1,085,057.48/1,095.08
  6. Step 6: Final answer
    x = 990.85

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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.