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Finding the Fourth Proportional to 1,382.28, 1,907.46 and 917.16

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Solution

The fourth proportional to 1,382.28, 1,907.46 and 917.16 is: 1,265.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,382.28 : 1,907.46 = 917.16 : x
  2. Step 2: Convert to fraction form
    1,382.28/1,907.46 = 917.16/x
  3. Step 3: Cross multiply
    1,382.28x = 1,907.46 × 917.16
  4. Step 4: Simplify right side
    1,382.28x = 1,749,446.01
  5. Step 5: Solve for x
    x = 1,749,446.01/1,382.28
  6. Step 6: Final answer
    x = 1,265.62

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1.5x scale

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.