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Finding the Fourth Proportional to 1,107.24, 1,528.61 and 665.25

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Solution

The fourth proportional to 1,107.24, 1,528.61 and 665.25 is: 918.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,107.24 : 1,528.61 = 665.25 : x
  2. Step 2: Convert to fraction form
    1,107.24/1,528.61 = 665.25/x
  3. Step 3: Cross multiply
    1,107.24x = 1,528.61 × 665.25
  4. Step 4: Simplify right side
    1,107.24x = 1,016,904.48
  5. Step 5: Solve for x
    x = 1,016,904.48/1,107.24
  6. Step 6: Final answer
    x = 918.41

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Double scale
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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.